# Werner Strauch - E-Commerce Consultant

> Independent e-commerce consultant helping brands make smarter technology decisions. Clear roadmaps, deep technical expertise, and results that actually matter.

Markdown versions of published pages. Each document links to its original HTML page.

## About and services

- [Werner Strauch | E-Commerce Consulting & Strategy](https://wernerstrauch.com/en/index.md): Independent e-commerce consultant helping brands make smarter technology decisions. Clear roadmaps, deep technical expertise, and results that actually matter.
- [About | Werner Strauch – E-Commerce Consultant](https://wernerstrauch.com/en/about.md): 20+ years in e-commerce. 7 years as CEO. I bridge the gap between technical complexity and business strategy – so you can make better decisions, faster.
- [Contact | Werner Strauch – E-Commerce Consulting](https://wernerstrauch.com/en/contact.md): Book a free discovery call. Let's discuss your e-commerce strategy, ERP selection, or Shopify project.
- [E-Commerce Audit | Systematic Shop Analysis | Werner Strauch](https://wernerstrauch.com/en/ecommerce-audit.md): Professional E-Commerce Audit: 500+ checkpoints, 50-100+ page report, prioritized actions. Systematic analysis of shop, SEO, conversion, technology and processes.
- [E-Commerce Consulting | Strategy, Processes & Technology | Werner Strauch](https://wernerstrauch.com/en/ecommerce-consulting.md): End-to-end e-commerce consulting: from strategy and process optimization to technology selection. Unbiased expertise for lasting growth.
- [E-Commerce Roadmap | Prioritized Implementation Planning | Werner Strauch](https://wernerstrauch.com/en/ecommerce-roadmap.md): Build your E-Commerce roadmap: prioritized initiatives, quick wins, and milestones for 12-24 months. From gap analysis to concrete execution.
- [E-Commerce Sparring | Your Strategic Thinking Partner | Werner Strauch](https://wernerstrauch.com/en/ecommerce-sparring.md): E-Commerce Sparring: Regular strategy sessions with an experienced e-commerce advisor. 2-4 calls per month, ongoing support on retainer from €1,500/month.
- [E-Commerce Strategy | Strategic Planning & Roadmap | Werner Strauch](https://wernerstrauch.com/en/ecommerce-strategy.md): Build your E-Commerce strategy: business model, channel strategy, technology, and KPIs. Get a strategy document and roadmap in 2-6 weeks. Vendor-neutral consulting.
- [E-Commerce Workshop | Strategy, Processes & Growth | Werner Strauch](https://wernerstrauch.com/en/ecommerce-workshop.md): E-Commerce Workshop for your team: Develop strategy, optimize processes, plan growth. Flexible format from half day to 2 days. On-site or remote.
- [Fractional CTO | Technology Leadership for E-Commerce | Werner Strauch](https://wernerstrauch.com/en/fractional-cto.md): Fractional CTO for e-commerce & digital: Technology strategy, tech stack decisions, and dev team leadership on a part-time basis. For startups, scale-ups, and mid-market companies.
- [Fractional Head of E-Commerce | Your E-Commerce Leader on Demand | Werner Strauch](https://wernerstrauch.com/en/head-of-ecommerce.md): Fractional Head of E-Commerce: Senior e-commerce leadership on a part-time basis. Ongoing. Flexible. With a network of specialists when you need it. For SMBs, mid-market, and D2C brands.
- [E-Commerce Implementation Support | Strategic Advisor & QA | Werner Strauch](https://wernerstrauch.com/en/implementation-support.md): Independent implementation support for e-commerce projects: strategic advisory, QA, vendor management. Shop migrations, ERP rollouts, system integrations. 2-8 days/month.
- [Legal Notice | Werner Strauch](https://wernerstrauch.com/en/imprint.md): Legal notice and information according to § 5 TMG for the website of Werner Strauch, E-Commerce Consultant.
- [E-Commerce Interim Management | Leadership on Demand | Werner Strauch](https://wernerstrauch.com/en/interim-management.md): E-Commerce Interim Management: Experienced leadership on demand for vacancies, transformations, or growth phases. Head of E-Commerce, CDO, Digital Sales Director. 3-12 month engagements.
- [Privacy Policy | digitalsprung GmbH](https://wernerstrauch.com/en/privacy.md): Privacy policy of the digitalsprung GmbH website. Information on the collection and processing of personal data.
- [E-Commerce Project Management | Shop Relaunch, Migration & ERP | Werner Strauch](https://wernerstrauch.com/en/project-management.md): External E-Commerce Project Management: Store relaunch, system migration, ERP implementation. Experienced project manager with proven methodology. From €4,000/month.
- [E-Commerce Services | Strategy, Consulting & Implementation | Werner Strauch](https://wernerstrauch.com/en/services.md): E-commerce services from analysis to execution: Audit, strategy, consulting, workshops, advisory, project management, and interim leadership. Independent expertise you can trust.
- [Shopify Expert | Unbiased Shopify Consulting | Werner Strauch](https://wernerstrauch.com/en/shopify-expert.md): Get strategic Shopify advice without the agency upsell. Platform decisions, app stack optimization, and architecture planning from an independent consultant.
- [E-Commerce Technology Consulting | System Selection & Integration | Werner Strauch](https://wernerstrauch.com/en/technology-consulting.md): Independent E-Commerce Technology Consulting: Select and integrate shop systems, ERP, PIM, CRM. RFI/RFP process, TCO analysis and modern architectures like Headless Commerce.

## E-commerce glossary

- [E-Commerce Glossary | All Terms & Metrics Explained](https://wernerstrauch.com/en/glossary.md): The comprehensive e-commerce glossary: From AOV to cart abandonment – all important terms, metrics and concepts explained simply.
- [AOV (Average Order Value) Calculator | Marketing Metric](https://wernerstrauch.com/en/glossary/aov-average-order-value.md): Average Order Value (AOV) shows how much a customer spends per order. Formula, calculator, example and optimization strategies.
- [ARPU (Average Revenue per User) Calculator | Metric](https://wernerstrauch.com/en/glossary/arpu-average-revenue-per-user.md): Average Revenue per User (ARPU) shows the value of each customer. Formula, calculator, example and strategies to increase it.
- [B2B E-Commerce Explained | Business-to-Business Commerce](https://wernerstrauch.com/en/glossary/b2b-e-commerce.md): B2B e-commerce: how businesses sell online to commercial buyers. Differences from B2C and the most common mistakes when building a B2B store.
- [Break-Even Point Calculator | Finance Metric](https://wernerstrauch.com/en/glossary/bep-break-even.md): The Break-Even Point shows when your online store becomes profitable. Formula, calculator, example and strategies to reach profitability faster.
- [Bounce Rate Calculator | Marketing Metric](https://wernerstrauch.com/en/glossary/bounce-rate.md): Bounce Rate shows the percentage of visitors who leave your site immediately. Formula, benchmarks, example and optimization strategies.
- [CAC (Customer Acquisition Cost) Calculator | Metric](https://wernerstrauch.com/en/glossary/cac-customer-acquisition-cost.md): Customer Acquisition Cost (CAC) shows the cost of acquiring a new customer. Formula, calculator, example and optimization strategies.
- [Cart Abandonment Rate Calculator | Marketing Metric](https://wernerstrauch.com/en/glossary/car-cart-abandonment.md): Cart Abandonment Rate shows how many visitors leave without completing a purchase. Formula, calculator, example and reduction strategies.
- [Churn Rate Calculator | Marketing Metric](https://wernerstrauch.com/en/glossary/churn-rate.md): Churn Rate shows the percentage of customers who leave. Formula, calculator, example and strategies to reduce customer churn.
- [CLV:CAC Ratio Calculator | Marketing Metric](https://wernerstrauch.com/en/glossary/clv-cac-ratio.md): The CLV:CAC Ratio shows the relationship between customer value and acquisition costs. Formula, calculator, example and optimization strategies.
- [CLV (Customer Lifetime Value) Calculator | Metric](https://wernerstrauch.com/en/glossary/clv-customer-lifetime-value.md): Customer Lifetime Value (CLV) shows the total value of a customer. Formula, calculator, example and CLV optimization strategies.
- [Contribution Margin Calculator | Finance Metric](https://wernerstrauch.com/en/glossary/cm-contribution-margin.md): Contribution Margin shows how much remains after variable costs to cover fixed costs. Formula, calculator, example and optimization strategies.
- [Contribution Margin I (CM1) Calculator | Finance Metric](https://wernerstrauch.com/en/glossary/cm1-contribution-margin-1.md): Contribution Margin I shows what remains after deducting COGS from revenue. Formula, calculator, example and optimization tips for online stores.
- [Contribution Margin II (CM2) Calculator | Finance Metric](https://wernerstrauch.com/en/glossary/cm2-contribution-margin-2.md): Contribution Margin II includes all variable costs per order. Formula, calculator, example and optimization tips for online stores.
- [Contribution Margin III (CM3) Calculator | Metric](https://wernerstrauch.com/en/glossary/cm3-contribution-margin-3.md): Contribution Margin III includes product-specific fixed costs like storage and marketing. Formula and calculator, example for online stores.
- [Conversion Rate Calculator | Marketing Metric](https://wernerstrauch.com/en/glossary/conversion-rate.md): Conversion Rate shows the percentage of visitors who complete a purchase. Formula, calculator, example and optimization tips.
- [Conversions API (CAPI) Explained | Meta Ads Tracking](https://wernerstrauch.com/en/glossary/conversions-api-capi.md): The Conversions API sends conversion data server-side directly to Meta — independent of cookies and iOS restrictions. Definition, how it works, and setup tips.
- [CPC (Cost per Click) Calculator | Marketing Metric](https://wernerstrauch.com/en/glossary/cpc-cost-per-click.md): Cost per Click (CPC) shows how much you pay per click on your ad. Formula, calculator, example and optimization tips.
- [CPM (Cost per Mille) Calculator | Marketing Metric](https://wernerstrauch.com/en/glossary/cpm-cost-per-mille.md): Cost per Mille (CPM) shows the cost per 1,000 impressions of your ad. Formula, calculator, example and optimization tips.
- [CTR (Click-Through Rate) Calculator | Marketing Metric](https://wernerstrauch.com/en/glossary/ctr-click-through-rate.md): Click-Through Rate (CTR) shows the percentage of users who click on your ad. Formula, calculator, example and optimization tips.
- [D2C (Direct to Consumer) Explained | E-Commerce Glossary](https://wernerstrauch.com/en/glossary/d2c-direct-to-consumer.md): D2C means brands sell directly to end customers — no retailers, no Amazon cut. Definition, unit economics, success factors and the real limits of the D2C model.
- [Double Opt-In (DOI) Explained | Email Marketing & GDPR](https://wernerstrauch.com/en/glossary/doi-double-opt-in.md): Double opt-in is the legally safe standard for email marketing. Definition, GDPR requirements, and how to convert more signups into subscribers.
- [ERP in E-Commerce Explained | Definition & Setup](https://wernerstrauch.com/en/glossary/erp-enterprise-resource-planning.md): ERP systems connect inventory, procurement, accounting, and order management in one platform. Definition, selection criteria, and implementation costs.
- [Gross Margin Calculator | Finance Metric](https://wernerstrauch.com/en/glossary/gm-gross-margin.md): Gross Margin shows the percentage of revenue remaining after cost of goods sold. Formula, calculator, example and optimization strategies.
- [Headless Commerce Explained | Architecture, Pros & Cons](https://wernerstrauch.com/en/glossary/headless-commerce.md): Headless commerce decouples frontend from backend. Definition, pros and cons, and why many stores return to classic architecture after migrating.
- [Inventory Turnover Calculator | Operations Metric](https://wernerstrauch.com/en/glossary/itr-inventory-turnover.md): Inventory Turnover shows how often your stock is sold and replaced per year. Formula, calculator, example and optimization strategies.
- [MDM (Master Data Management) Explained | Definition](https://wernerstrauch.com/en/glossary/mdm-master-data-management.md): MDM consolidates all master data into one controlled source. How it differs from PIM, when stores need it, and what implementation costs look like.
- [MER (Marketing Efficiency Ratio) Calculator | Metric](https://wernerstrauch.com/en/glossary/mer-marketing-efficiency-ratio.md): Marketing Efficiency Ratio (MER) shows the ratio of total revenue to marketing spend. Formula, calculator, example and optimization tips.
- [Net Margin Calculator | Finance Metric](https://wernerstrauch.com/en/glossary/nm-net-margin.md): Net Margin shows profit after all costs relative to revenue. Formula, calculator, example and strategies to improve profitability.
- [NPS (Net Promoter Score) Calculator | Marketing Metric](https://wernerstrauch.com/en/glossary/nps-net-promoter-score.md): Net Promoter Score (NPS) measures customer satisfaction and willingness to recommend. Methodology, calculation, example and improvement strategies.
- [Net Revenue Calculator | Finance Metric](https://wernerstrauch.com/en/glossary/nr-net-revenue.md): Net Revenue shows your actual revenue after deducting returns, discounts and taxes. Formula, calculator, example and optimization strategies.
- [Out-of-Stock Rate Calculator | Operations Metric](https://wernerstrauch.com/en/glossary/oos-out-of-stock.md): Out-of-Stock Rate shows what percentage of your products are unavailable. Formula, calculator, example and reduction strategies.
- [PIM (Product Information Management) Explained | Definition](https://wernerstrauch.com/en/glossary/pim-product-information-management.md): A PIM system centralizes all product data across channels. Definition, how it differs from ERP and DAM, and which systems are relevant for e-commerce.
- [Product Margin Calculator | Finance Metric](https://wernerstrauch.com/en/glossary/pm-product-margin.md): Product Margin shows how profitable a product is after deducting all variable costs. Formula, calculator, example and margin optimization strategies.
- [POAS (Profit on Ad Spend) Calculator | Marketing Metric](https://wernerstrauch.com/en/glossary/poas-profit-on-ad-spend.md): Profit on Ad Spend shows the real profit from your advertising – more meaningful than ROAS. Formula, calculator, example and optimization strategies.
- [Retention Rate Calculator | Marketing Metric](https://wernerstrauch.com/en/glossary/retention-rate.md): Retention Rate measures what share of customers stay active over time. Formula, industry benchmarks, cohort analysis, and the most effective strategies.
- [ROAS (Return on Ad Spend) Calculator | Marketing Metric](https://wernerstrauch.com/en/glossary/roas-return-on-ad-spend.md): Return on Ad Spend (ROAS) shows how much revenue each advertising dollar generates. Formula, calculator, example and optimization tips.
- [Repeat Purchase Rate Calculator | Marketing Metric](https://wernerstrauch.com/en/glossary/rpr-repeat-purchase-rate.md): Repeat Purchase Rate shows the percentage of customers who order again. Formula, calculator, example and strategies to increase customer loyalty.
- [Revenue per Visitor (RPV) Calculator | Marketing Metric](https://wernerstrauch.com/en/glossary/rpv-revenue-per-visitor.md): Revenue per Visitor (RPV) combines Conversion Rate and AOV into one metric. Formula, calculator, example and optimization strategies.
- [Return Rate Calculator | Operations Metric](https://wernerstrauch.com/en/glossary/rr-return-rate.md): Return Rate shows what percentage of orders are sent back. Formula, calculator, example and strategies to reduce returns.
- [Sell-Through-Rate Calculator | Operations Metric](https://wernerstrauch.com/en/glossary/str-sell-through-rate.md): Sell-Through-Rate shows how quickly your inventory sells. Formula, calculator, example and strategies for inventory optimization.
- [Topical Authority Explained | SEO Strategy for E-Commerce](https://wernerstrauch.com/en/glossary/topical-authority.md): Topical authority describes how completely a website covers a subject area. Definition and how to build authority systematically.
- [Working Capital Calculator | Definition & Formula](https://wernerstrauch.com/en/glossary/working-capital.md): Working capital shows how much capital is tied up in operations. Formula, e-commerce drivers, the working capital cycle, and how to free up trapped capital.

## Articles

- [AI in E-Commerce 2026: How Artificial Intelligence Is Revolutionizing Online Retail](https://wernerstrauch.com/en/blog/ai-ecommerce-2026.md): AI in E-Commerce 2026: Key applications from product descriptions to image generation and chatbots. Trends, tools, and practical examples for online retailers.
- [B2B Shop Systems Compared: Which Platform Actually Fits Your Business](https://wernerstrauch.com/en/blog/b2b-shop-system-comparison.md): Shopware, SAP Commerce Cloud, Adobe Commerce, Salesforce, OroCommerce & more — a no-nonsense strategic comparison. What actually drives scalability, beyond feature checklists and vendor promises.
- [Back-in-Stock Alerts: Turn 'Sold Out' Into Loyal Customers](https://wernerstrauch.com/en/blog/back-in-stock.md): Back-in-Stock is more than a notification email. Learn how the right strategy recovers 4-7% of lost revenue while building lasting customer loyalty.
- [How to Reduce Cart Abandonment: The Complete Playbook for Online Stores](https://wernerstrauch.com/en/blog/cart-abandonment.md): 72% of shopping carts are abandoned before checkout. Here's how to prevent it with checkout optimization, email sequences, exit-intent strategies, and retargeting — backed by data.
- [Checkout Optimisation: Why 68% of Your Customers Disappear Right Before They Buy](https://wernerstrauch.com/en/blog/checkout-optimisation.md): 70% of checkout starts end without a purchase. How to reduce abandonment, increase conversion rates, and unlock six-figure revenue potential through systematic checkout optimisation — with data, formulas, and concrete action steps.
- [Cross-Selling & Upselling: Why 80% of Recommendations Fail — And How Your Store Joins the 20%](https://wernerstrauch.com/en/blog/cross-selling-upselling.md): Cross-selling and upselling done right: The timing paradox, the relevance rule, and which Shopify app makes sense at which revenue stage. With AOV calculator and email framework.
- [B2B Customer Journey: Why Your Buyers Have Already Decided Before They Call Your Sales Team](https://wernerstrauch.com/en/blog/customer-journey-b2b.md): 73% of B2B buyers have made 70% of their purchasing decision before ever speaking to a salesperson. The complete framework: 6 stages, buying committee, touchpoints, customer journey map, and KPIs for enterprise sales.
- [Customer Lifetime Value in Shopify: How to Calculate, Analyze, and Maximize It](https://wernerstrauch.com/en/blog/customer-lifetime-value-shopify.md): CLV is the most important metric for sustainable Shopify growth. Learn how to calculate it from your Shopify data, calibrate your CLV:CAC ratio, and grow it systematically with 7 proven strategies — formulas, benchmarks, and calculators included.
- [D2C Strategy: When Direct to Consumer Is Actually Profitable](https://wernerstrauch.com/en/blog/d2c-strategy.md): Channel conflict, unit economics, and the 6 decisions every D2C strategy requires. A practical guide for manufacturers and brands in the DACH market.
- [E-Commerce Churn Rate: What Every Lost Customer Really Costs Your EBITDA](https://wernerstrauch.com/en/blog/ecommerce-churn-rate.md): Churn is e-commerce's silent revenue killer — because customers don't cancel, they just stop buying. How to calculate churn rate, spot early warning signals, and measure the real EBITDA impact: the complete analysis framework.
- [E-Commerce KPIs: The 5 Numbers That Decide Whether Your Store Grows or Stalls](https://wernerstrauch.com/en/blog/ecommerce-kpis-metrics-guide.md): All important e-commerce KPIs at a glance: From financial to marketing to customer metrics. With formulas, example calculations, and industry benchmarks for your success.
- [Ecommerce Platform Comparison 2026: Shopify, Shopware, WooCommerce, Magento](https://wernerstrauch.com/en/blog/ecommerce-platform-comparison.md): Which ecommerce platform actually fits your business? The vendor-neutral comparison of Shopify, Shopware, WooCommerce and Magento — with decision matrix, TCO breakdown and a clear recommendation by growth stage.
- [Choosing an E-Commerce Platform: 8 Criteria That Decide](https://wernerstrauch.com/en/blog/ecommerce-platform-selection.md): Shopify, Shopware, or WooCommerce? 8 vendor-neutral criteria for choosing an e-commerce platform, with a selection checklist and TCO calculation for DACH merchants.
- [E-Commerce Return Rate: What Every Percentage Point Costs Your Profit](https://wernerstrauch.com/en/blog/ecommerce-return-rate.md): 550 million returns per year in Germany alone — yet most e-commerce businesses only see the surface. How to calculate your return rate, analyze true return costs, and measure the real EBITDA impact: the complete practical framework.
- [Google Merchant Center Feed: The Complete 2026 Guide](https://wernerstrauch.com/en/blog/google-merchant-center-feed.md): Set up your Google Merchant Center feed correctly: required attributes, GPSR disclosures, error troubleshooting, and the migration to the Merchant API by August 2026.
- [Headless Commerce: The Honest Guide for Mid-Market Retailers 2026](https://wernerstrauch.com/en/blog/headless-commerce.md): Headless commerce explained: architecture, real costs, an interactive TCO calculator, and an honest answer to who should actually switch in 2026.
- [Klaviyo vs. Shopify Email: When Is Switching Actually Worth It?](https://wernerstrauch.com/en/blog/klaviyo-vs-shopify-email.md): Klaviyo or Shopify Email? An honest cost comparison, an original break-even formula, a flow comparison, and a GDPR check for European merchants.
- [Outsource Fulfillment: When It's Time and What You Need to Know](https://wernerstrauch.com/en/blog/outsource-fulfillment.md): When does outsourcing fulfillment actually make financial sense? The vendor-neutral guide with full cost breakdown, contract traps, D2C specifics, and a 12-week migration plan — for online stores doing $500k+ in revenue.
- [Paid, Owned & Earned Media: Why Most Stores Are Burning Their Budget on the Wrong Channel](https://wernerstrauch.com/en/blog/paid-owned-earned-media.md): Why allocating 80% of your budget to paid media is a long-term trap — and how the PESO framework (Paid, Owned, Earned, Shared) structurally improves your marketing ROI. With concrete e-commerce examples, GMV-based budget allocation, and interactive calculators.
- [PIM for Shopify: When Metafields Are No Longer Enough](https://wernerstrauch.com/en/blog/pim-for-shopify.md): When does a PIM for Shopify pay off, and when do Metafields suffice? Vendor-neutral comparison with decision matrix, real costs, and clear recommendations for e-commerce teams.
- [Plytix PIM for Shopify: Honest Review, Real Costs and When It Makes Sense](https://wernerstrauch.com/en/blog/plytix-shopify-review.md): Plytix PIM for Shopify in an honest practical review: current 2026 costs, hidden add-on pricing, technical integration limits, and when to choose a different PIM instead.
- [Product Page Optimization: Why 97 Out of 100 Visitors Leave Without Buying](https://wernerstrauch.com/en/blog/product-page-optimization.md): 97 out of 100 visitors don't buy. How to close the purchase decision gap: the 3-second rule, Cialdini mapping, the objection stack, and the complete Shopify technical setup most guides skip.
- [RFM Analysis for Shopify: How to Segment Customers for More Revenue](https://wernerstrauch.com/en/blog/rfm-analysis-shopify.md): RFM analysis for Shopify: a formula and 11 customer segments, GDPR limits on profiling, an honest comparison of Shopify segments, Klaviyo, and CDPs, plus a zero-party data strategy.
- [ROAS: Why Your Best Campaign Metric Might Still Mean You're Losing Money](https://wernerstrauch.com/en/blog/roas-return-on-ad-spend.md): Learn how to calculate ROAS, determine your break-even ROAS from your margin, and use channel benchmarks to make smarter ad spend decisions. With interactive calculators.
- [Shopify B2B: What Actually Works in 2026, and Where It Falls Short](https://wernerstrauch.com/en/blog/shopify-b2b-guide.md): Shopify B2B in 2026: pricing, customer groups, net terms and ERP integration explained. An honest comparison with Shopify Plus and Shopware, limits included.
- [How to Create Shopify Bundles: The Complete Guide (2026)](https://wernerstrauch.com/en/blog/shopify-create-bundles.md): Native Shopify Bundles App, Mix & Match, or third-party app? Step-by-step setup, app comparison, AOV calculator, and bundle SEO — everything online retailers need to know.
- [Shopify Bookkeeping & DATEV Export: The Workflow That Prevents Duplicate Postings](https://wernerstrauch.com/en/blog/shopify-datev-bookkeeping.md): How to set up Shopify bookkeeping for German tax compliance: DATEV export, sevdesk vs. lexoffice, the full technical workflow from order to posting, and the five most expensive booking mistakes.
- [Shopify Different Prices for Customers: 4 Methods for Customer Group Pricing 2026](https://wernerstrauch.com/en/blog/shopify-different-prices-customers.md): How to set different prices for customers in Shopify: 4 methods compared, tiered pricing, B2B price lists, apps, and native Shopify B2B catalogs. With interactive margin and discount calculators.
- [Shopify ERP & Inventory Management 2026: Which System Actually Fits Your Store?](https://wernerstrauch.com/en/blog/shopify-erp-guide.md): JTL, Xentral, Billbee or Pickware? An unbiased comparison of the best ERP and inventory management systems for Shopify — with decision matrix, TCO breakdown, and a clear recommendation by growth stage.
- [Shopify Liquid Explained: The Template Language, and When Custom Development Is Actually Worth It](https://wernerstrauch.com/en/blog/shopify-liquid.md): Shopify Liquid explained in plain terms: objects, tags, filters with examples, plus an honest cost breakdown for when custom Liquid development pays off.
- [Shopify Multi-Store: When Multiple Storefronts Actually Pay Off](https://wernerstrauch.com/en/blog/shopify-multiple-stores.md): Shopify multiple stores in 2026: Markets, expansion stores and headless multi-storefront compared. Real costs, legal pitfalls and a decision checklist.
- [Shopify Scaling: The 5D Framework for Sustainable Growth from $100K to $5M GMV](https://wernerstrauch.com/en/blog/shopify-scaling.md): Scaling a Shopify store from $100K to $5M GMV: The 5D Scaling Framework shows what breaks at each growth stage — and how to fix it before it breaks you.
- [Best Shopify Themes 2026: Free & Paid — How to Choose the Right One](https://wernerstrauch.com/en/blog/shopify-themes.md): The best free and paid Shopify themes in 2026 — speed-tested, compared by shop type, with a 24-point checklist and a clear decision framework for serious merchants.
- [Subscription Commerce: When Building a Subscription Model Actually Pays Off](https://wernerstrauch.com/en/blog/subscription-commerce.md): Subscription commerce for e-commerce: core models, a break-even formula, churn benchmarks, EU cancel-button rules, and an honest tool comparison.
- [E-Commerce SEO 2026: Why Topical Authority Matters More Than Backlinks](https://wernerstrauch.com/en/blog/topical-authority-ecommerce-seo-2026.md): Topical Authority is the decisive SEO concept for online shops in 2026 — more important than backlinks. This guide shows you how to build it, measure it, and get cited by AI search engines like ChatGPT and Perplexity.

## Attribution & usage

Please cite: Werner Strauch – [Topic] – wernerstrauch.com. Summaries are allowed; full-text reproduction is not permitted.