Internal linking: structure beats quantity

What internal links actually do

Internal links fulfill three tasks at the same time, and only one of them is obvious.

They guide readers onward. That is the visible function. A good link in the text takes someone to the next relevant piece of information instead of leaving them stranded at the end of the page.

They show connections. Search engines use linking to recognize which pages belong together thematically. A page that is linked from twelve other pages on the same topic is considered the central document on that topic.

They distribute authority. Pages that receive links from outside pass part of that strength on through internal links. A strong page that links to nothing gives away this effect completely.

The third point is the reason why internal linking achieves more than most people expect. It is the mechanism you use to direct strength to where it is needed.

The reason this works

Internal links fulfill three tasks at the same time, and only one of them is obvious.

They guide readers onward. That is the visible function. A good link in the text takes someone to the next relevant piece of information instead of leaving them stranded at the end of the page.

They show connections. Search engines use linking to recognize which pages belong together thematically. A page that is linked from twelve other pages on the same topic is considered the central document on that topic.

They distribute authority. Pages that receive links from outside pass part of that strength on through internal links. A strong page that links to nothing gives away this effect completely.

The third point is the reason why internal linking achieves more than most people expect. It is the mechanism you use to direct strength to where it is needed.

The cluster structure

Randomly placed links achieve little. What works is a deliberate structure, and the simplest form that works is the topic cluster.

A cluster consists of a pillar article that covers a topic broadly and several detail articles that go deeper into subtopics. All detail articles link to the pillar. The pillar links to the most important details. The details link to each other where it makes sense content-wise.

The result: search engines recognize that the pillar is the central document, and all detail articles support it. At the same time, the details benefit from the strength of the pillar.

Without this structure, the opposite happens. Five articles on similar topics that don't reference each other compete for the same search terms, and none of them wins out.

Anchor texts: the part almost everyone gets wrong

The anchor text is the linked text. It tells search engines and readers what is on the destination page. Accordingly, every link with the anchor text “here”, “learn more” or “read more” gives away exactly this information.

Three rules are enough:

The anchor text describes the destination. Not “more on this”, but “how a website relaunch works”.

Vary the wording. If twenty links carry the same anchor text, it looks unnatural. Different phrases for the same destination are better than one that appears twenty times.

No link without a benefit. A link placed just for the sake of linking disrupts the reading flow and helps nobody. If you hesitate while writing about whether a link makes sense, leave it out.

How many links per page

There is no fixed number, but there are useful guidelines.

Three to five text links per article are right for most content. At least one of them should go to the pillar of its own cluster.

Every important page needs at least three incoming links from the body text of other pages. Links from the navigation and footer hardly count, because they appear on every page and therefore say nothing about connections.

No orphan pages. A page that only the navigation points to signals: it is not important enough to be mentioned in the text. Search engines treat it accordingly.

The fastest test: take your five most important pages and count how many text links from other pages point to them. If the answer is zero, you have your first assignment.

Linking as a workflow, not a cleanup job

Adding internal linking to an existing body of content afterwards is tedious. Thinking about it while writing costs almost nothing.

A simple workflow that has proven itself: before writing an article, note three existing pages it will link to and two existing pages that should link to it. After publishing, add the two incoming links.

That takes ten minutes per article and prevents you from ending up with a body of content without structure after twenty articles.

If you already have a larger body of content: start with the pages that bring in visitors. That is where the authority is that can be distributed. And work your way outward from there instead of going alphabetically.

What a glossary and knowledge section have to do with it

A glossary is more than a reference work. Linked properly, it is the densest part of the internal structure.

Every technical term that appears in articles can point to its definition the first time it appears. Conversely, every definition points to the articles in which the term plays a role. This creates a network that becomes denser with every new article, without any extra effort.

Important: the definitions must be in the delivered HTML, not loaded later via JavaScript. Otherwise, some search engines and practically all AI crawlers see neither the definition nor the linking.

This is a point where many websites leave potential untapped that they have already worked for.