SEO Knowledge

How search engines work and why SEO matters for your business.

1. 1What Is SEO? Getting Started with Search Engine OptimizationBeginnerSEO makes sure your website gets found when people search for your topics – without paying for every click. Here you learn what lies behind it.
2. 2SEO for Beginners: The Complete Guide to Getting StartedBeginnerSEO feels big at first. With a clear plan, though, getting started is doable. This guide takes you from the foundation through content to measuring success.
3. 3How Search Engines Work: Crawling, Indexing, RankingBeginnerBefore you optimize, you have to understand what happens between the search input and the results list: the three phases crawling, indexing, and ranking – plus everything that makes up the modern SERP.
4. 4Crawling and Indexing: How Google Discovers and Stores PagesIntermediateFor a page to rank, Google first has to find it and add it to the index. This deep dive shows the technical mechanisms behind that – from robots.txt to the canonical tag.

From ranking factors to guidelines: the strategic guardrails of successful search engine optimization.

1. 5Google Ranking Factors: What Really Influences Your PositionBeginnerGoogle evaluates hundreds of signals to place your page. This article sorts the most important ranking factors into five categories – from search intent to user signals.
2. 6Google SEO Guidelines: The Fundamentals of Google SearchBeginnerGoogle's guidelines are no guarantee of position 1, but they are the basis for your content being found and understood. This article explains the "Google Search Essentials".
3. 7E-E-A-T: How to Build Experience, Expertise, Authority and TrustIntermediateE-E-A-T stands for Experience, Expertise, Authoritativeness and Trustworthiness. This article shows what is behind the concept, why it is not a direct ranking factor and how to make it visible on your website.
4. 8SEO Myths Debunked: What Really Counts for RankingBeginnerNumerous half-truths and outdated assumptions circulate around SEO. This article clears up 19 of the most persistent SEO myths and explains what really matters in optimization.
5. 9Developing an SEO Strategy: The Guide in Nine StepsIntermediateA well-thought-out SEO strategy is the foundation for sustainable visibility. This guide leads in nine steps from taking stock through goals and content to on-page, technical and off-page SEO.
6. 10Competitive Analysis in SEO: How to Find and Beat Your CompetitorsIntermediateThe SEO competitive analysis shows you who really competes with you in organic search and where unused opportunities lie. This guide leads step by step through the analysis of keywords, content, backlinks and technology.
7. 11Domain Types: Which Domain and TLD Fits Your ProjectBeginnerA domain name is the address of your website – and more than a technical necessity. This article explains the building blocks of a domain, the different TLD types and how to choose the right domain for your project.

Finding the right terms and understanding what searchers really want.

1. 12Keyword Research: How to Find the Right Search TermsBeginnerKeywords are the bridge between what people search for and what you offer. Clean research is the foundation of every content strategy – here you learn it from the ground up.
2. 13Keyword Types: The Most Important Kinds and Their Strategic UseBeginnerNot all keywords are the same: some bring first-time visitors, others buyers ready to purchase. Anyone who knows the keyword types builds the right mix for every goal.
3. 14Search Intent: Understanding What Searchers Really WantIntermediateThe best keyword is worthless if your content answers the wrong question. Search intent is the most important relevance factor in modern search – here you learn how to hit it.
4. 15Keyword Clustering: Ranking Topics Instead of Single KeywordsIntermediateOptimizing single keywords is no longer enough. Keyword clusters bundle related content into a topic – and signal genuine expertise to Google.
5. 16Keyword Mapping: Every Keyword Gets Its Target URLIntermediateGoogle ranks each URL individually. Keyword mapping assigns every page a clear keyword target – the basis for a clean structure and stable rankings.
6. 17Keyword Cannibalization: When Your Pages Beat ThemselvesAdvancedSometimes your own website becomes your biggest competitor: several pages fight over the same keyword. Here is how to spot and fix cannibalization.

Optimizing pages and content so that they rank and convert.

1. 18On-Page SEO: Factors, Elements, and Best PracticesIntermediateOn-page SEO covers everything you control directly on your page: content, structure, HTML, and technology. Here you learn the factors that decide your ranking.
2. 19Content That Ranks: Quality, E-E-A-T, and OptimizationIntermediateGood content is no accident. It grows out of understood search intent, clean structure, E-E-A-T, and consistent optimization. This is how you create content with ranking substance.
3. 20Optimizing Meta Tags: More Clicks from the Search ResultIntermediateMeta tags are invisible to visitors but decisive for the search result. Here you learn which tags really count and how to optimize them for more clicks.
4. 21Internal Linking: Distributing Authority DeliberatelyIntermediateInternal links are signposts for users and search engines – and one of the most underestimated SEO levers. This is how you build a link structure that deliberately distributes authority.
5. 22External Links: Linking Outward with ConfidenceIntermediateExternal links are more than signposts: they are signals of credibility and relevance. Here's how to set outbound links with confidence – without harming your own site.

Planning, maintaining and keeping content up to date – from the content type to the refresh.

1. 23Why Content Marketing Is Crucial for Your SuccessBeginnerPeople tune out traditional advertising. Content marketing attracts them – with content that delivers real added value. Here you learn why that works.
2. 24Content Types: Which Format Works Best and WhenBeginnerNot only the topic decides the success of your content, but also the format. Here you learn which content type works best and when.
3. 25Image SEO: Optimizing Images for Search EnginesIntermediateImages are more than decoration – they are a traffic source in their own right. With targeted optimization, they become discoverable, fast, and accessible.
4. 26Duplicate Content: Detecting and Fixing Duplicate ContentIntermediateThe same content under several URLs confuses search engines and weakens your visibility. This is how you detect and fix duplicate content.
5. 27Content Pruning: Ranking Better with Less ContentAdvancedSometimes rankings rise when you remove content. Content pruning makes your website healthier by clearing ballast and strengthening quality.
6. 28Content Refresh: Reviving Existing ContentAdvancedInstead of always producing new content, a content refresh gets more out of existing pages – often faster and cheaper.

Crawlability, indexing and performance as the foundation of any visibility.

1. 29What Is Technical SEO? Getting Started With Your Website’s FoundationBeginnerTechnical SEO is the foundation on which content and backlinks can take effect in the first place. Here you learn what it covers and why it determines your visibility.
2. 30Robots.txt: Steering Crawlers and Saving Crawl BudgetIntermediateThe robots.txt is a small text file with a big effect: it guides search engine crawlers through your website – if you know its limits.
3. 31XML Sitemaps: How Google Finds All Your Important PagesIntermediateAn XML sitemap is the blueprint of your website for search engines. It ensures that even remote pages get found and indexed.
4. 32Detecting and Fixing Crawling ErrorsIntermediateIf Google can't crawl a page, it never ranks. Here's how to detect and fix crawling errors before they cost you visibility.
5. 33Optimizing Crawl Budget: More Visibility for Large WebsitesAdvancedOn large websites, crawl budget determines whether Google finds your important pages quickly. This is how you steer Googlebot precisely toward what matters.
6. 34Log File Analysis for SEO: Understanding Real Crawl BehaviorAdvancedLog files are the only data source that shows exactly how search engine bots crawl your website. This is how you use them for technical SEO.
7. 35Technical SEO: Crawlability, Core Web Vitals, and Index ControlAdvancedTechnical SEO is the foundation: if crawlers cannot reach, render, and understand your pages efficiently, all content work fizzles out.

How pages get into the index and how HTTP status codes and redirects work.

1. 36HTTP Status Codes Clearly ExplainedIntermediateEvery request on the web is answered by the server with a status code. These three-digit numbers help decide crawling, indexing, and user experience.
2. 37Redirects: Using Forwarding CorrectlyIntermediateRedirects guide users and search engines from an old URL to the new one. Used correctly, they preserve your visibility – set up wrong, they cost rankings.
3. 38Solving Indexing Problems: Finding and Fixing CausesIntermediateEven perfectly optimized content stays invisible if Google does not index it. This is how you find the cause and get your pages into the index.
4. 39Removing URLs from Google: Methods and Use CasesIntermediateWhether outdated content, sensitive data, or duplicates – deliberately removing URLs from Google requires the right method. Here is the guide.
5. 40Pagination and SEO: Splitting Pages CorrectlyAdvancedPagination splits large amounts of content – but implemented wrongly, it costs visibility. This is how you make page numbering SEO- and user-friendly.

Website architecture, loading time and rendering as the technical foundation for rankings and user experience.

1. 41URL Structure: Understandable, Search-Engine-Friendly Web AddressesIntermediateYour URL is the postal address of every page. Here you'll learn how to build web addresses so that users and search engines understand them instantly.
2. 42Website Architecture: The Foundation for Users and SEOIntermediateA good website architecture makes your content easy to find for users and crawlers. Here you learn the principles of flat structures and strong internal linking.
3. 43PageSpeed Optimization: Improving Website Speed SystematicallyIntermediateEvery second of load time costs users and revenue. Here you'll learn how to make your website measurably faster – from Core Web Vitals to CDN.
4. 44Mobile SEO and the Mobile-First Index: The GuideIntermediateGoogle indexes your website based on the mobile version. Here you'll learn how to optimize for the mobile-first index – from technology to UX.
5. 45Structured Data: The Guide to Rich Results and More VisibilityAdvancedStructured data are labels that explain your content to search engines. Here you'll learn how to use them to win rich results and more visibility.
6. 46JavaScript SEO: The Guide for Modern WebsitesAdvancedJavaScript makes websites dynamic – and sometimes hard for search engines to read. Here you'll learn how your content still gets indexed reliably.
7. 47Edge SEO: Implement SEO Changes Directly in the CDNAdvancedEdge SEO moves SEO changes to the edge of the network – onto your CDN's servers. This way you implement fixes in hours instead of waiting months for the dev team.

Building reputation outside your own site – above all through structured link building.

1. 48What Is Off-Page SEO? Building Authority and TrustBeginnerOff-page SEO happens outside your website: backlinks, mentions, reviews, and reputation. Here's how to build authority and trust with it.
2. 49Link Building: Basics, Strategies, and High-Quality LinksIntermediateBacklinks have been a central ranking factor since PageRank. Here you learn what makes a high-quality link and which strategies build links sustainably.
3. 50Outreach for Link Building: Relationships Instead of Mass EmailsIntermediateOutreach decides the success of your link building. Here you learn how to find the right partners, qualify them, and convince them with personalized messages.
4. 51Broken Link Building: Winning Backlinks via Broken LinksAdvancedBroken link building uses broken links on other pages: you offer your content as a replacement. Here you learn the complete process from research to outreach.
5. 52Guest Posts for SEO: Building Authority and BacklinksIntermediateGuest posts are more than link building: they build authority and open up new target groups. Here you learn platform selection, the pitch, and creating strong guest articles.

High-quality backlinks, domain authority and digital PR as trust signals.

1. 53Domain Authority: What the Metric Says – and What It Doesn'tIntermediateDomain Authority estimates a website's ranking strength on a scale of 1 to 100. Important: it's a Moz metric, not a direct Google ranking factor. Here you'll learn what really lies behind it.
2. 54Backlink Analysis: Check Your Link Profile, Find Risks and OpportunitiesIntermediateA backlink analysis examines all incoming links to your website: it uncovers harmful links, assesses link quality and reveals new link-building opportunities. Here you'll learn the complete process.
3. 55Devaluing Backlinks: When the Disavow Tool Is Really NecessaryAdvancedGoogle usually ignores bad backlinks automatically today. That is why the Disavow Tool is only rarely necessary. Here you learn when it is really useful – and when it is better to leave it alone.
4. 56Digital PR: Reputation, Reach, and Editorial LinksAdvancedDigital PR goes beyond link building: it builds reputation, reach, and editorial links through newsworthy content and media relationships. Here you see the distinction and the core elements.

SEO specifics of common content management and shop systems.

1. 57WordPress SEO: The Complete Guide to Optimizing Your WebsiteBeginnerWordPress is considered SEO-friendly – but the tool alone does not rank. Here you learn how to combine technical basis, content, and plugins into real visibility.
2. 58WordPress SEO Plugins: The Best Tools at a GlanceIntermediateAn SEO plugin takes mechanical optimization work off your hands and reminds you of important basics. Here you learn which tool fits your project.
3. 59Wix SEO: How to Optimize Your Wix Website for Search EnginesBeginnerWix has a reputation for being SEO-weak – unjustly. The platform provides solid tools. Here you learn how to use them to move your website forward.
4. 60Shopify SEO: How to Move Your Shop Forward on GoogleIntermediateShopify takes a lot of technical SEO work off your hands but has its own pitfalls. Here you learn how to use product pages, structure, and the blog to make your shop visible.
5. 61Webflow SEO: Clean Code as a Ranking AdvantageIntermediateWebflow enjoys a good SEO reputation – thanks to lean code and full control over the important levers. Here you learn how to exploit the potential.
6. 62Squarespace SEO: Optimize Your Website and Rank BetterIntermediateSquarespace is unjustly considered SEO-weak. The platform provides a solid technical basis – entirely without plugins. Here you learn how to fully exploit it.
7. 63Magento SEO: Technical Optimization for Adobe Commerce ShopsAdvancedMagento is powerful, but SEO success does not come on its own. The default settings rarely suffice – here you learn which technical levers really count.

Visibility beyond Google – on marketplaces, social platforms and other search engines.

1. 64Amazon SEO: Optimizing Product Listings for Better RankingsIntermediateOn Amazon, a single goal decides your ranking: the purchase probability. Here you learn how the algorithm ticks and how to align your listing with it.
2. 65YouTube SEO: Optimizing Videos for Better RankingsIntermediateYouTube rewards videos that captivate people and keep them on the platform for a long time. Here you learn how to align your videos precisely with that.
3. 66TikTok SEO: Boosting Your Visibility on TikTok DeliberatelyIntermediateFor many young users, TikTok is the new search engine. Here you learn how to make your videos discoverable and connect them with the right audiences.
4. 67Reddit SEO: Using the Platform for Greater VisibilityIntermediateReddit has become one of the most influential players in search results. Here you learn how to use the platform authentically and effectively for SEO.
5. 68Bing SEO: Optimizing for Microsoft’s Search EngineIntermediateBing serves not only Microsoft’s search but also Copilot and other search engines. Here you learn how to optimize specifically for Bing.
6. 69Baidu SEO: Optimizing for China’s Leading Search EngineAdvancedThe Chinese market is huge – but the gateway is not Google, it is Baidu. Here you learn the particularities that decide success.
7. 70Yandex SEO: Optimizing for Russia’s Leading Search EngineAdvancedYandex has its own algorithms, tools, and priorities. Here you learn the most important differences from Google and how to optimize specifically for Yandex.

User experience and behavioral signals that indirectly influence rankings.

1. 71Testing Mobile-Friendliness: Tools and Criteria for Mobile WebsitesBeginnerMore than half of all search queries come from smartphones. Here you learn what makes a website mobile-friendly and which tools you use to check it today.
2. 72User Experience and SEO: Why User Experience Shapes Your RankingIntermediateSEO is long since more than keywords and backlinks. Google evaluates how users experience your website. Here you learn how UX and ranking are connected.
3. 73Social Signals: How Social Media Indirectly Strengthens Your SEOIntermediateDo likes and shares influence your Google ranking? Not directly – but indirectly very much so. Here you learn how social signals strengthen your visibility.
4. 74Online Reviews: Trust, Purchase Decisions, and SEOIntermediateOver 90% of consumers trust online reviews like personal recommendations. Here you learn how reviews build trust and strengthen your visibility.

AI Overviews, generative search and what that means for your SEO strategy.

1. 75SEO in the AI Era: AI Overviews, GEO, and Generative SearchIntermediateChatGPT, AI Overviews, and Perplexity are changing how people find answers. Those who want to stay visible no longer optimize only for ten blue links.