Topic Clusters: How to Plan Content Google Trusts

Key takeaways

• A topic cluster is one complete guide (the pillar) plus 5 to 10 shorter articles, each answering one narrower search.
• Plan from searches you can win: clear intent, low difficulty, close to what you sell.
• Links go both ways. Every supporting article links to the pillar, and the pillar links to every supporting article.
• Publish the pillar first, then one supporting article at a time, linking each new page as it goes live.

A topic cluster is a group of pages about one subject, built around a single guide. The guide, called the pillar, covers the subject broadly. Each supporting article takes one narrower question, answers it in depth, and links back to the pillar. The pillar links to every supporting article in return.

That's the whole idea. The rest of this guide is how to plan one, how to link it, and what goes wrong.

What a topic cluster is

Think of a coffee shop in New York. Its pillar might be "The best coffee shops in New York". Supporting articles would each answer one search around it:

• Best cold brew in NYC
• Cafés for remote work
• Coffee catering for events
• Single-origin vs blend
• Best beans to buy for home
• Dog-friendly cafés

Each of those is a real question someone types into Google or asks an AI assistant. Each gets its own page, written to answer that question better than anything else on page one. And each one links to the guide, which links back.

This blog is built the same way. Here is the cluster you're reading right now:

Topic clusters The 5-in, 8-out ruleKeywords you can winKD, explained

Why clusters beat one-off posts

Search engines look for signs that a site covers a subject well. One post about cold brew says little. A complete guide plus eight related articles, all linked to each other, says a lot more.

Links are part of how that gets noticed. Google's own documentation says it uses links "as a signal when determining the relevancy of pages and to find new pages to crawl", and that every page you care about should have a link from at least one other page on your site. A cluster is a way of making sure that's true on purpose, not by accident.

Clusters help readers too. Someone who lands on one article always has an obvious next step, which keeps them on your site longer and gives them more reasons to trust you.

They also suit AI search. Google says there are no special tricks for AI Overviews and AI Mode (more on that in how to show up in ChatGPT and AI answers): content that is findable through internal links, written in text, and genuinely helpful is what qualifies. A well-linked cluster is exactly that.

Dex's take: many small sites already have plenty of posts, just no structure. Grouping the posts you have into clusters is often the fastest first win.

How to plan a cluster in 5 steps

1. Pick one product or service you want customers to find. One cluster, one offer. If a topic doesn't lead to something you sell, it's a hobby, not a cluster.
2. List the searches around it. A keyword tool gives you monthly volume and difficulty for each one. For a coffee catering service, that list might include "coffee catering for events", "coffee cart rental cost" and "wedding coffee bar". Read more on how to find keywords you can actually win.
3. Choose the pillar: the broadest search you can realistically win. Not the biggest search in your industry; the biggest one your site has a chance at. Keyword difficulty helps you judge that.
4. Choose 5 to 10 supporting searches, one article each. If two would answer the same question, keep one. Two pages chasing one search compete with each other.
5. Publish the pillar first, then one supporting article at a time, and link each one as it goes live.

The linking rules

Links are what turn a pile of articles into a cluster. These are the numbers Dex works to on every site. They're our house rules, not Google's, but they keep every page connected:

The rule people forget is the last one. It's easy to add links from a new article. It's just as important to go back and link to it from older ones. We go deeper in the 5-in, 8-out rule for internal links.

Two details matter as much as the count:

• Anchor text describes the destination. Google recommends anchor text that is "descriptive, reasonably concise, and relevant". "Read our guide to keyword difficulty" beats "click here".
• Links go in the body, in context. A link inside a sentence that explains why it's relevant is useful to a reader. A block of twenty links in a footer isn't.

What goes on a pillar page

A pillar is a map of the subject. It should be good enough to read on its own, and it should make every supporting article easy to find. In practice, strong pillars share the same anatomy:

1. The answer first. One or two sentences that define the subject or answer the main question, right under the title. Readers decide in seconds whether they're in the right place, and AI answers tend to quote these lines.
2. A short summary of what's covered. A "key takeaways" box or a three-line overview.
3. One section per supporting article. Each section gives the short version of the answer, then links to the supporting article for the full version. This is where most of the pillar's links live.
4. Something only you can show. A worked example, a table of real numbers, a photo from your own work, a mistake you've seen clients make.
5. An FAQ for the questions that are too small for their own article.
6. Sources for every claim that isn't your own experience.

What a pillar shouldn't be is a long list of links with a sentence each. If a reader finishes the pillar without learning anything, it isn't a guide; it's a table of contents.

A complete cluster plan, start to finish

Here's what a finished plan looks like for the coffee catering example. Volumes and difficulty are illustrative, but the structure is exactly what Dex proposes:

Notice what's missing: "coffee history", "how to make espresso at home", "best coffee beans". They're coffee searches, but nobody typing them is about to book a caterer.

How many articles you need

There's no magic number. Dex usually plans one pillar and six to nine supporting articles, then adds more once the first ones start to rank and Search Console shows what else people search for.

Length follows the job. Dex's defaults are 2,200 to 3,000 words for a pillar, because it has a lot of ground to cover, and 1,000 to 1,500 words for a supporting article. Longer isn't better if it answers the question less directly: the best supporting articles give the answer in the first paragraph and spend the rest proving it.

Publishing order

Publish the pillar first so every supporting article has something to link up to on day one. Then publish one supporting article at a time. When each goes live:

1. Link it to the pillar.
2. Add a link to it from the pillar.
3. Add links to it from one or two older siblings, where they genuinely fit.

That last step is the one that keeps the "links in" count healthy as the cluster grows. Publishing everything at once tempts you to link to pages that don't exist yet, which leaves broken links for crawlers and readers.

URLs and structure

The structure of your URLs should match the structure of your clusters. It's not a ranking trick; it makes the site easier to understand for readers, for search engines and for you when you look at reports.

• One folder per cluster. This blog uses /blog/topic-clusters/ for the pillar and /blog/topic-clusters/keyword-difficulty/ for a supporting article. One glance at a URL tells you where a page belongs.
• Short, readable slugs. Use the words of the search, without dates or filler. A slug like coffee-cart-rental-cost will still make sense in five years.
• Breadcrumbs on every page. Home › Blog › Cluster › Article. They give readers a way up, and search engines can show them in results.
• Never change a URL without a redirect. If you must rename a page, send the old URL to the new one with a permanent (301) redirect, and update your internal links to point straight at the new one.

Keeping a cluster fresh

A cluster isn't finished when the last article goes live. Three habits keep it ranking:

1. Review the pillar every few months. Update what changed (prices, tools, rules), and show the new "updated" date.
2. Mine Search Console for new articles. When the cluster starts appearing for searches it doesn't answer well yet, those are the next supporting articles.
3. Refresh pages stuck on page two. A page sitting around positions 8 to 20 is close. A clearer answer, a better example or a few more internal links can be enough to move it.

Turning the posts you already have into clusters

Most sites don't start from zero. If you've been blogging for a while, this is usually the fastest win, because the pages already exist and Google already knows them.

1. List every post with its URL, title and the search it seems to target.
2. Group them by offer, not by date or category. Each group is a cluster candidate.
3. Find or write the pillar for each group. Sometimes an existing post can be expanded into it; often it has to be written.
4. Merge duplicates. Two posts answering the same question should become one, with a redirect from the old URL to the one you keep.
5. Add the missing links in both directions, starting with links to the posts that have the fewest.

How to tell if a cluster is working

Clusters move in a predictable order, so measure in that order. In Google Search Console's Performance report, filter pages by the cluster's URL folder (for example, URLs containing /blog/topic-clusters/) and watch:

1. Impressions rise first: Google is showing your pages for more searches.
2. Average position improves next, usually for the supporting articles before the pillar.
3. Clicks follow once pages reach the first page.

If impressions stay flat for several weeks after publishing, check the basics before writing more: are the pages indexed, are they linked, and do they answer the search better than what's already ranking?

Mistakes that sink clusters

• Two articles chasing the same search. They compete with each other and both rank worse.
• Links that only go out. New articles link to old ones, but nothing links back.
• Publishing everything at once with links to pages that don't exist yet.
• Topics you don't sell. Traffic that never turns into customers.
• Facts nobody checked. One wrong price or promise costs more trust than the article earns, and it's the usual reason AI-written pages fail.

How Dex runs this for you

Dex is an AI SEO agent that does each step above on your site: it reads what you sell, researches the searches around it, proposes a cluster for you to approve, writes and fact-checks each article, publishes them in the right order, and keeps the links balanced in both directions as the cluster grows. If you'd rather see the plan first, get your free SEO plan from your URL.

FAQ

What's the difference between a pillar page and a regular post?

+

A pillar covers the whole subject at a high level and links to every supporting article. A regular post answers one question. In a cluster, both exist and point at each other.

How long until a cluster starts ranking?

+

It depends on competition and your site's history. Easier searches can move within weeks, harder ones take months. Track positions from the first week so you see movement before traffic arrives.

Can I turn old blog posts into a cluster?

+

Yes, and it's often the fastest win. Group old posts by topic, pick or write a pillar for each group, then add the missing links in both directions.

Should every article link to every other article?

+

No. Every supporting article links to the pillar and to a few close siblings. Linking everything to everything dilutes the links that matter.

Sources

1. SEO link best practices for Google · Google Search Central
2. Creating helpful, reliable, people-first content · Google Search Central
3. AI features and your website · Google Search Central

Dex SEO

Dex SEO is an AI SEO agent for small businesses. Every article here is planned from search data, drafted by Dex, fact-checked against the sources it cites, and reviewed by the team before it is published.

How this article was made: drafted with AI, fact-checked against the sources listed above, then edited and approved by the Dex SEO team.