Internal Linking for SEO: The Hub and Cluster System

Most internal linking guides are the same article wearing a different logo. They explain what an internal link is, mention PageRank, show you a pyramid diagram, and send you on your way.

What they never show you is a real site's cluster map. Which pages link where, why, and which page is supposed to make the money at the end of it all. I went and read the top ranking guides before writing this, and not one of them shows you their own site's linking structure or talks about where the enquiries actually come from.

So that is what this post does. I am going to show you the exact hub and cluster system we use on every Glide site, including this one. By the end you will be able to map your own site in an afternoon. And here is the nice part: once the map exists, the system mostly runs itself. Every new post slots into a known spot. No agonising, no spreadsheet of shame.

Why internal links beat most link building

Backlinks get all the glory in SEO. For most small business sites, internal links quietly do more. Three reasons.

You control them. Getting a backlink means asking someone else to link to you, and hoping. Placing an internal link takes ten seconds, needs nobody's permission, and Google picks it up on the next crawl. It is the only part of link building where you hold the pen.

They are free. No outreach, no guest posts, no "quick favour" emails. If you have more than about ten pages, you are sitting on link equity you have already paid for. Most owners just never spend it.

Most sites waste them. Nearly every site I audit has the same pattern: a decent blog full of posts that link to nothing, a services page nothing links to, and a scattering of "click here" anchors. If your competitors are doing that, and they almost certainly are, tidy internal linking is one of the cheapest advantages available to you.

There is a mechanical reason this works. Authority flows through internal links in much the same way it flows through backlinks. When a good backlink lands on one of your blog posts, your internal links decide where that authority goes next. With no internal links, it just sits there in the post, doing nothing for the pages that pay your bills.

This is not theory for us. Here is one of our clients' Search Console graphs, built with exactly two ingredients: useful content and disciplined internal linking. No paid link building at all.

The hub and cluster system

Here is the structure we build on every site. It has three types of page and four linking rules.

The hub is one big guide that covers a whole topic properly. Think of it as the table of contents for everything you know about that subject. Ours for this topic is the Technical SEO Playbook.

The spokes are the specific guides underneath it. Each one goes deep on a single job: heading structure, page speed, internal linking (hello), and so on.

The money page is the service page where people actually enquire. For this cluster, that is our SEO service page.

And the four rules that connect them:

• Every spoke links up to the hub.
• Every spoke links across to two or three sibling spokes where it genuinely helps the reader.
• The hub links down to every spoke.
• The hub links down to the money page.

That last rule is the one almost every guide skips, and it is the one that pays for everything else. Here is the logic.

Blog posts are good at earning rankings and backlinks, because people link to useful guides. But they are bad at winning enquiries, because someone reading "how headings work" is learning, not buying. Service pages are the opposite: great at converting, terrible at attracting links, because nobody links to a sales page out of kindness.

The hub bridges the two. Authority earned anywhere in the cluster flows up to the hub, and the hub hands it to the SEO service page, which is the page we actually want ranking for commercial searches. The guides do the earning, the money page does the converting, and the links are the plumbing between them. Build the plumbing once and every new post you publish makes the money page a little stronger, without you doing anything extra.

How to pick your hubs: your services are your hubs

This is where people overthink it. You do not need a content strategist or a keyword brainstorm to choose your hubs.

Your services are your hubs. One hub per thing you sell. If you are a plumber who does boiler installs, bathroom fitting and emergency callouts, those are your three hubs. Each hub is the complete guide to that topic, and each one points at the matching service page.

The test for whether a topic deserves a hub is simple: does it have a money page underneath it? If a topic cannot ever lead to an enquiry, it does not need a hub. It might still be worth a post, but it joins an existing cluster rather than starting a new one.

This also tells you what to write next, forever. Every new post should be a spoke for one of your hubs. If an idea does not fit any hub, that is the system politely telling you it probably will not bring you customers.

Anchor text rules

Anchor text is the clickable wording of the link, and Google reads it as a description of the page on the other end. Three rules cover almost everything:

• Be descriptive. Say what the page is about in plain words. "Our guide to heading structure" beats "this post" every time, because it tells Google and the reader exactly what they are getting.
• Vary the wording. If ten links all say "internal linking strategy" in exactly those words, it reads like a robot built it, because one did. Mix it up the way you would in normal speech: "how we structure internal links", "our linking system", "this guide to internal links".
• Never "click here". It describes nothing, it passes no meaning, and it wastes the most valuable part of the link. Same goes for "read more" and "learn more" in body copy.

One more habit worth stealing: link from within sentences, not from lists bolted onto the end of a post. A link placed mid paragraph, at the moment the reader actually wants it, carries more weight with Google and gets clicked more by humans. Those bolted-on "related posts" widgets are better than nothing, but contextual links in the body are the ones doing the real work.

The orphan page problem

An orphan page is a page with no internal links pointing at it. It might be in your sitemap, it might even be indexed, but as far as your site structure is concerned it does not exist. No authority flows into it, readers cannot stumble onto it, and Google quietly learns to treat it as unimportant.

Orphans happen by accident. A post gets published in a hurry, a service page gets added and nobody links it from the navigation, an old page survives a redesign but loses all its links. I find them on almost every audit.

Finding yours takes about twenty minutes:

• Crawl your site with Screaming Frog (free up to 500 URLs). The crawl can only find pages that links lead to, which is exactly the point.
• Open Search Console, go to Indexing then Pages, and export the list of pages Google knows about. Grab your sitemap list too.
• Compare the two. Any page Google or your sitemap knows about that the crawl never reached is an orphan.

The fix is rarely complicated. Find the cluster the orphan belongs to, add a link from the hub and one or two relevant spokes, and it rejoins the family. If you cannot find any page that should naturally link to it, ask the harder question: why does this page exist at all?

How many links per post? Three to five beats twenty

The temptation, once you understand that links pass authority, is to cram them in everywhere. Resist it.

The value a page passes is shared across the links on it, so twenty links each pass a sliver while four pass a meaningful slice. Stuffed posts also read terribly, and a reader who feels herded stops trusting the links entirely.

Our rule on every Glide post: three to five contextual links in the body, each one earning its place. Up to the hub, across to the siblings that genuinely help, and that is usually it. Navigation and footer links sit on top of that, but the body links are the ones we plan.

A decent test for each link: if the reader clicked it right now, would they thank you? If yes, keep it. If it is only there for Google, cut it.

This post is the worked example

Here is the part I promised at the top. You are inside the system right now.

This post is a spoke in our Technical SEO cluster. It links up to the Technical SEO Playbook, which is the hub. It links across to its siblings, like our guides to semantic HTML for SEO and correct heading structure, because if you care about internal linking you will probably care about those too. And the hub links down to the SEO service page, which is where the enquiries land.

Every rule in this post is being applied by this post. Count the body links: you will find a handful, all contextual, all descriptive, none saying "click here". If this guide earns a backlink or two, that authority will flow up to the playbook and on to the service page, exactly as drawn in the diagram. The system does the work; I just wrote the post and slotted it in.

That is really the whole pitch for hub and cluster linking. It is not a tactic you keep performing. It is a structure you build once, and then every piece of content you ever publish drops into place and pulls in the same direction. Map your hubs this week, fix your orphans, tighten your anchors, and let it compound while you get on with running the business.

Mike McDonnell, Founder of Glide Marketing. More about how I work.