--- title: "Topical Authority and Topic Clusters: How to Build Topical Authority in 2026" description: "What topical authority is, how topical depth differs from breadth, and how to build a topic cluster that Google and LLMs understand." date: 2026-11-01 author: "Ewelina Podrez-Siama" url: "https://podrez.pl/en/topical-authority/" categories: - "SEO Blog" --- Originally published [in Polish](https://podrez.pl/topical-authority-i-klastry-tematyczne/): 4 October 2025 · Updated: 1 November 2026 · English translation: 1 November 2026 **In [my article on entity, context and intent](https://podrez.pl/en/entity-context-intent/) I talked about how search evolved. Now it’s time to get to the heart of SEO: your content.** Google increasingly evaluates sites not at the level of a single article, but across a whole topic area. If you want the search engine to see you as an expert, you need to build more than a collection of posts: an ecosystem of knowledge. That’s where **topic clusters** (*content clusters*) and **pillar pages** come in, a standard in SEO today. In short **Topical authority** is how far a search engine (and increasingly LLMs) sees your site as a comprehensive source on one topic. **Topical depth** is how deeply you cover a topic. It’s depth, not the number of topics you touch, that builds authority. **A topic cluster** is the architecture: a pillar page and supporting posts connected by links. The cluster is the architecture, depth is the consistency, authority is the result. Workshop recording This article sums up part of my SEO workshop at [semKRK #23 BIG](https://semkrk.pl/) in Kraków. Participants rated it 5/5. The recording is in Polish. [Watch the recording on YouTube (2 hours)](https://youtu.be/Hq7KN5KV_Tk) Before I add even one new text to a cluster, I check which existing posts can be merged or linked better. Table of contents [Toggle](#) - [What exactly is topical authority?](#what-exactly-is-topical-authority) - [Where the term comes from, and what Google has said](#where-the-term-comes-from-and-what-google-has-said) - [What affects topical authority?](#what-affects-topical-authority) - [Topical depth vs topical breadth](#topical-depth-vs-topical-breadth) - [How does the algorithm judge specialization?](#how-does-the-algorithm-judge-specialization) - [What if you run several projects?](#what-if-you-run-several-projects) - [YMYL: when the stakes are higher](#ymyl-when-the-stakes-are-higher) - [Topic clusters: what are they?](#topic-clusters-what-are-they) - [Clusters and entities: how Google “thinks” about your content](#clusters-and-entities-how-google-thinks-about-your-content) - [Why do topic clusters matter?](#why-do-topic-clusters-matter) - [How to build your own topic cluster \[CHECKLIST\]](#how-to-build-your-own-topic-cluster-checklist) - [How not to build topic clusters: the most common mistakes](#how-not-to-build-topic-clusters-the-most-common-mistakes) - [Topic clusters in the age of AI Overviews and AI Mode](#topic-clusters-in-the-age-of-ai-overviews-and-ai-mode) - [What building clusters achieves](#what-building-clusters-achieves) - [A practical decision about your specialization](#a-practical-decision-about-your-specialization) - [Summary](#summary) - [Questions about topical authority](#questions-about-topical-authority) What exactly is topical authority? ---------------------------------- Before we go further, let’s settle one thing: **topical authority is not the same as “domain authority”**. It’s not about how long your site has existed or how many linking partners you have. It’s about *whether you’re an expert on a given topic* and whether Google can **prove it from your content**. Definition Topical authority is how far a search engine sees a domain or a person as a credible, comprehensive source of knowledge on a specific topic. You can’t be an expert on everything. But you can be **the authority on your topic**, whether that’s technical SEO, skincare or product photography. It’s not the result of a single article. **It’s a signal computed from hundreds of documents, connections and citations, which the algorithm builds about you over months and years.** TOPICAL AUTHORITYexpertise in one topicStructuretopical clusterpillar page, supportingposts, internal linksQualityE-E-A-Tauthor experience,sources, data, examplesDepthtopical depthanswers to questionsat every levelMissing any one of them weakens the whole.TOPICAL AUTHORITYexpertise in one topicStructuretopical clusterPillar page, supporting postsand internal links.QualityE-E-A-TAuthor experience, sources,data and examples.Depthtopical depthAnswers to questions at everylevel of detail, no gaps.Missing any one of them weakens the whole. Topical authority is the sum of three elements: structure, quality and depth. Source: “Marka osobista w czasach AI i generatywnego wyszukiwania”, my own diagram. ### Where the term comes from, and what Google has said - ### Industry: Koray Tuğberk Gübür The term was popularized by a semantic SEO specialist who described the mechanism based on Google patents and his own case studies. - ### Google, 2023: topic authority The name topical authority isn’t in the guide to ranking systems. But Google did describe a [topic authority system for news](https://developers.google.com/search/blog/2023/05/understanding-news-topic-authority): for news on a given subject or region, it surfaces sources that specialize in them. - ### The 2024 leak: siteFocusScore Google’s internal search API documentation includes attributes such as **siteAuthority**, **siteFocusScore** (how focused a site is on one topic) and **siteRadius** (how far pages drift from the site’s main topic). Google confirmed the documents were authentic, but said they were incomplete and out of context. My take We don’t know how much weight these attributes carry in ranking. What we do know is that a site’s topical focus is measured, and pages far from the main topic stand out from the rest. For practical purposes that’s enough: write in the topic you want to be an expert in. ### What affects topical authority? - **1**### Topic coverage Whether you cover all key threads, from the pillar page to subtopics, with no gaps or orphan pages. - **2**### Depth of coverage How thoroughly you develop each thread: step-by-step processes, data, examples, edge cases, comparisons, implementation tips. - **3**### Semantic consistency Whether concepts connect logically: clear definitions, consistent terminology, contextual linking and structured data that pins down entities. - **4**### Author experience Practical examples, case studies, methodology, tools and a named author with a bio. - **5**### Internal and external linking Pillar page ↔ supporting posts, descriptive anchors, links to credible sources where they aid understanding. - **6**### External reputation Links and citations from the industry, expert mentions, talks and interviews. Quality and topical relevance count, not volume. - **7**### Trustworthiness A named author and publisher, contact details, data sources, publication and update dates, disclosure of partnerships. - **8**### Freshness Regular reviews and additions, responding to industry changes, updating the whole cluster consistently. - **9**### Technical support Clear architecture, breadcrumbs, no cannibalization, canonicalization where needed, indexability and a sitemap. A note on terms **[E-E-A-T](https://podrez.pl/en/e-e-a-t/) is a quality framework**, not a “ranking factor” as such. In practice it shows which qualities Google expects from content that wins in the long run. In short: **topical authority is trust you have to earn with content, not with keywords.** Topical depth vs topical breadth -------------------------------- Depth from the list above is most often confused with topical breadth: Topical breadth and topical depthWhat it measuresExample**Breadth**how many different threads you covera marketing blog: SEO, ads, social media, analytics**Depth**how far down you go in each of theman SEO blog with separate articles on crawl budget, structured data, intent and entities Length has little to do with it: a deep article can be a thousand words, and a shallow one ten thousand. Which of them builds authority? In my view, depth, because it shows you understand the topic from the inside. Breadth without depth ends in a series of posts that touch everything a little and… wrap nothing up. A topic as a tree The root is your main specialization, say SEO strategy. The branches are specific areas: technical SEO, content, link building, analytics, local SEO. Each branch has its own offshoots: crawl budget, Core Web Vitals, JavaScript indexing, structured data. The more fully you cover the tree, the stronger the depth signal. When planning, a simple distinction helps me: horizontal and vertical growth. Horizontally, you add new topics side by side. Vertically, you go down into one topic, level by level. Take link building: HorizontalbreadthVerticaldepthOutreach?Directories?PR?Three topics side by side,each only on the surface.Link building guideLink profile analysisLink velocityLinks and topical authorityA case from one industryHorizontalbreadthOutreachDirectoriesPRThree topics side by side, each only on the surface.VerticaldepthLink building guideLink profile analysisLink velocityLinks and topical authorityA case from one industry Horizontal and vertical growth, using link building as the example. My own diagram. You can see topical depth in a few things: - ### Question coverage You answer questions in the niche at different levels of difficulty, from basics to edge cases. - ### Connections between content Internal linking works like a map of the topic: you can see what follows from what. - ### Time and consistency You publish in the area regularly, for months and years, not once per campaign. - ### Citations in the same context Others mention and link to you specifically on this topic. What does it look like for one topic? With search intent, most articles stop at four types: informational, navigational, commercial, transactional (I covered them in [Entity, context and intent](https://podrez.pl/en/entity-context-intent/)). If you want to go deeper, one topic turns into several: - **1**### Intent and click-through How the type of intent affects the CTR of results. - **2**### The buying journey and seasons How intent changes over time; before the holidays, shopping queries grow. - **3**### User vs algorithm How what a person wants differs from how Google reads the query. - **4**### Format for intent When an article, when a video, a product page or a tool. - **5**### Intent in data How to recognize intent in Google Search Console reports. Five in-depth articles from one starting point. That’s why instead of asking “what else can I write about?”, I more often ask: **“have I exhausted this topic yet?”** How does the algorithm judge specialization? -------------------------------------------- Imagine two people who write about content marketing. - ### Person A For three years they’ve written only about content marketing strategy: articles, case studies, trend analyses, answers to detailed industry questions. Others quote and link to them in exactly that context. - ### Person B For five years they’ve written about content marketing, SEO, social media, personal branding, leadership and productivity. Every article is good, but the signal is blurred. Who gets cited in AI Overviews for a question about content marketing strategy? Most likely person A. That isn’t unfair, it’s logical. The algorithm looks for an expert on X and picks the one the information network consistently and unambiguously associates with X. The signal has to be clear, repeated and confirmed from outside. ### What if you run several projects? I run several myself: podrez.pl about SEO and GEO, the keto blog ms-fox.pl and travel guides. The conclusion was partly a surprise to me: many projects don’t have to dilute a personal brand. They can strengthen it, under two conditions. The algorithm has to understand that one person connects them, and each domain has to build its own topic cluster, without mixing contexts. - **1**### Separate topics Each domain builds depth in its own niche, without mixing contexts. - **2**### Fewer random links Link between projects only where it makes sense for the reader. - **3**### One person in the data A tailored description of the person in each site’s structured data, tying the projects together in the knowledge graph. Covering many topics is a problem only when the algorithm doesn’t understand what connects them. **When it does, it becomes proof of the breadth of your authority, not of its dilution.** YMYL: when the stakes are higher -------------------------------- In some industries topical authority weighs more. Google singles out YMYL (*Your Money or Your Life*) content, where wrong information can genuinely affect health, finances or safety. That includes medicine, law, personal finance, nutrition and dietetics. Here, writing a lot and writing well isn’t enough. External confirmation of expertise counts: education, certificates, affiliations, citations in credible sources. Google’s quality rater guidelines also distinguish between two things: - ### Experience A guide on cooking keto from your own recipes. Documented personal experience is enough here. - ### Expertise Recommending a specific diet as a therapy. That needs institutionally confirmed expertise. An example from my blog My keto blog also shows what depth looks like in practice. The “keto diet” cluster isn’t just recipes, but also edge-case questions: keto in pregnancy, with PCOS, after 40. Topics like these show you understand the niche rather than just publishing in it. More on this in [E-E-A-T in practice](https://podrez.pl/en/e-e-a-t/). Topic clusters: what are they? ------------------------------ A topic cluster is a group of related pages on a site that together develop one topic. - ### Pillar page An extensive guide or overview article that covers the topic broadly and points to the supporting posts. - ### Supporting articles Smaller, deeper articles on individual threads. They link back to the pillar and to each other. The result? A map of knowledge that is easy to navigate for both users and Google’s crawler. If your pillar page is “Everything about SEO”, supporting articles could cover keyword research, on-site optimization, link building or competitor analysis. Each of those articles links back to the main guide, and the guide links to them. This architecture helps Google understand that your site **covers the subject comprehensively**. Another example of a cluster: PILLAR PAGEHow to lose weight?The complete guideHow to lose weightbefore a wedding?How to lose weightafter 40?How to lose weightfast?How to losebelly fat?How to loseface fat?How to lose 10 kgin a month?How to avoidthe yo-yo effect?Why am I notlosing weight?Each post links to the pillar page, and the pillar links back to each post.PILLAR PAGEHow to lose weight?The complete guideHow to lose weightbefore a wedding?How to lose weightafter 40?How to lose weightfast?How to losebelly fat?How to loseface fat?How to lose 10 kgin a month?How to avoidthe yo-yo effect?Why am I notlosing weight?Each post links to the pillar page,and the pillar links back. An example topic cluster around a pillar page. My own diagram. Clusters and entities: how Google “thinks” about your content ------------------------------------------------------------- When you build topic clusters, you don’t just organize content, you also **help Google build a miniature knowledge graph of your site**. Each article describes concepts that algorithms see as [entities](https://podrez.pl/en/entity-context-intent/) with relationships to others. When you create logical connections between them (links, context, shared meanings), the search engine starts to see your site not as a set of independent pages, but as **a system of connected concepts**. Example You have an article on “How to run an SEO audit” and another on “How to analyze server logs for indexing”. By linking them and adding the context “an SEO audit includes log analysis”, you show Google that **you understand the topic more deeply than, say, your competitors**. That’s the essence of topical authority: **being a guide to a world of concepts, not just the author of articles.** Why do topic clusters matter? ----------------------------- - **1**### Users get everything in one place A cluster leads from the general to the specific. The user reads, goes deeper, comes back and stays longer. Engagement grows (and if you track bounce rate in GA4, remember it’s 100% minus the engagement rate). - **2**### Google “understands” your ecosystem Logically connected content helps algorithms understand hierarchy and context. Topical authority is the result of a combination of signals: topic coverage, content quality, linking and reputation. - **3**### You support E-E-A-T Since March 2024, helpfulness signals have been part of Google’s core ranking systems. Consistent, original sources of knowledge have it easier as a result. E-E-A-Ttopicaldepthtrustvisibility+=+E-E-A-T+topicaldepth=trust+visibility E-E-A-T and topical depth together build trust and visibility. How to build your own topic cluster \[CHECKLIST\] ------------------------------------------------- Want to implement topic clusters on your site? Here are the steps I recommend: 1. 1**Choose a pillar topic**Find an area that is key to your brand or offer. It should be broad but specific, e.g. “SEO for e-commerce”, “healthy eating”, “product photography”. 2. 2**Create the pillar page**Write an extensive article that gives the full picture of the topic. Don’t go into every detail: sketch the map, and leave the details to supporting posts. 3. 3**Define subtopics**List the threads you can develop in separate posts. Google Search Console data, keyword research tools and AnswerThePublic will help: check what people actually ask. 4. 4**Write supporting articles**Each should answer a specific question or aspect of the topic. Substantive, concrete, no padding: every paragraph should make sense on its own. 5. 5**Plan internal linking**On the pillar page, add a section linking to the supporting posts, and in the posts, add links back to the pillar and to each other where natural. Use descriptive anchors and link to trusted external sources. 6. 6**Update regularly**Add new articles as new questions appear. Respond to changes in the industry. Topical authority is a process, not a project: trust is built over time. How not to build topic clusters: the most common mistakes --------------------------------------------------------- Clusters only work when they’re well thought out. These are the mistakes I see most often in audits: - ### Unconnected content Posts sit side by side, but nothing ties them together. - ### A pillar that’s too broad “Everything about marketing” is an ocean, not a topic. - ### A scope that’s too narrow “How to add a link in CMS X” isn’t enough for a whole cluster. - ### Overdone linking Links wherever possible, instead of where they help. - ### No updates Clusters are living organisms, not static structures. Topic clusters in the age of AI Overviews and AI Mode ----------------------------------------------------- AI Overviews and AI Mode use the same index and the same ranking systems as regular results ([Google says so in its own guide](https://podrez.pl/en/google-ai-search-guide/)). So topical authority works here too, and on top of that, models look for sources consistently associated with a topic. If your content is interconnected, topically consistent, signed by an author and clearly structured, you have a better chance that **fragments of your site will appear in an AI answer**. Short, disconnected posts drop off the radar. **Consistency, quality and context matter more than ever.** How we got here from BERT and MUM, I describe in [the second part of my semKRK workshop write-up](https://podrez.pl/en/entity-context-intent/#from-bert-to-ai-mode). What building clusters achieves ------------------------------- My experience (and Fox Strategy case studies) shows that after rebuilding a blog into a “pillar page + topic clusters” model: - ### More keywords in the top 10 The number of keywords on page one often grows by dozens of percent. - ### More traffic Organic traffic can grow by as much as 60–80%. - ### Fewer dead pages The number of pages with zero traffic drops noticeably. Google simply **understands your site better**. It knows it isn’t a collection of random articles, but a deliberate structure of knowledge. ![Marka osobista w czasach AI i generatywnego wyszukiwania – Ewelina Podrez-Siama](https://podrez.pl/wp-content/uploads/2025/11/marka-osobista-w-czasach-ai-719x1024.jpg "Topical Authority and Topic Clusters: How to Build Topical Authority in 2026") Book · currently in Polish Marka osobista w czasach AI i generatywnego wyszukiwania Speak about one thing so you can speak about everything. **Topical authority, entities and specialization are the core of the chapter this article is based on.** Published in Polish by Onepress/Helion in June 2026. [About the book →](https://podrez.pl/marka-w-czasach-ai/) A practical decision about your specialization ---------------------------------------------- Before you start building clusters, answer one question: **what do you want to own in the knowledge graph, the algorithm’s symbolic “mind”?** Not “what do I write about”, but: which specialization and role in the information network should Google and LLMs associate with your name (or brand)? It’s a strategic decision you make once. After that, all your content, connections and signals build one consistent picture. The topic cluster is the architecture. Topical depth is the consistency. **Topical authority is the result.** Summary ------- Content without structure isn’t enough today. If you want Google to see you as an authority in your field, build content in clusters, look after internal linking, semantics and entities. It’s not just an SEO matter, it’s a way to show you genuinely understand the topic you write about. Topical authority isn’t won with a single article. **It’s built systematically: one piece of content, one connection at a time.** Read next --------- - ![Topical Authority and Topic Clusters: How to Build Topical Authority in 2026](https://podrez.pl/wp-content/uploads/2026/11/e-e-a-t-w-praktyce-768x432.webp "Topical Authority and Topic Clusters: How to Build Topical Authority in 2026")Content quality ### [E-E-A-T in practice](https://podrez.pl/en/e-e-a-t/) How Google verifies who you are, not just what you write. - ![Topical Authority and Topic Clusters: How to Build Topical Authority in 2026](https://podrez.pl/wp-content/uploads/2026/11/encja-kontekst-intencja-768x404.webp "Topical Authority and Topic Clusters: How to Build Topical Authority in 2026")The basics ### [Entity, context and intent](https://podrez.pl/en/entity-context-intent/) Why a keyword alone no longer cuts it. - ![Topical Authority and Topic Clusters: How to Build Topical Authority in 2026](https://podrez.pl/wp-content/uploads/2026/04/ilovemkt16-768x512.jpg "Topical Authority and Topic Clusters: How to Build Topical Authority in 2026")Case study ### [From string to entity](https://podrez.pl/en/from-string-to-entity/) How I made AI recognize who I am. Questions about topical authority --------------------------------- ### How is topical authority different from domain authority? Domain authority is a metric from SEO tools, calculated mainly from links. Topical authority is about one topic: how far a search engine sees your site as a comprehensive, credible source on that particular subject. A site with strong links may have no authority in a topic it rarely writes about. ### What is topical depth? It’s how deeply you cover a topic: how far you go into each thread, from the basics to edge-case questions. In my view, depth, not breadth, decides whether the algorithm sees you as an expert. ### Does Google officially confirm topical authority? The name topical authority isn’t in Google’s guide to ranking systems. In 2023, though, Google described a topic authority system for news, and the 2024 documentation leak revealed attributes such as siteFocusScore and siteRadius. So we know topical focus is measured, even if we don’t know its weight. ### How many articles does a topic cluster need? There’s no threshold. A cluster is complete when it answers the questions people ask in the topic, without gaps or repeats. Eight well-connected articles beat thirty shallow ones. ### Does writing about several topics hurt? It hurts when the algorithm doesn’t understand what connects them. If you run several projects, let each build depth in its own niche, while your entity (a person or a brand) ties them together at the knowledge graph level. ### Sources Google Search Central, [Understanding news topic authority](https://developers.google.com/search/blog/2023/05/understanding-news-topic-authority) (May 2023). Google Search Central, [March 2024 core update and new spam policies](https://developers.google.com/search/blog/2024/03/core-update-spam-policies) (March 2024). Search Engine Land, [Unpacking Google’s massive search documentation leak](https://searchengineland.com/unpacking-googles-massive-search-documentation-leak-442716) (May 2024). Szymon Słowik, [SiteFocus, siteRadius and topical authority in SEO](https://www.szymonslowik.com/sitefocus-siteradius-and-topical-authority-in-seo/). Ewelina Podrez-Siama, [Marka osobista w czasach AI i generatywnego wyszukiwania](https://podrez.pl/marka-w-czasach-ai/) (in Polish), Onepress 2026, chapter on topical authority. SEO workshop at semKRK #23 BIG (2025). An LLM may have supported me in preparing this text – most often at the translation, research, proofreading or code-styling stage. The responsibility for the decisions, the claims made and the arguments cited is fully mine. More on [how I work with AI](https://podrez.pl/en/authorship-and-ai/).