Internal linking is the only ranking-relevant signal you control completely, and most sites use a fraction of what they already have. Every link you add is a vote you cast for your own page, placed exactly where you want it, at no cost and with nobody's permission.
It also does something more specific than passing authority around: it tells search engines which of your pages is the main one on a subject. That is what a topic cluster is for.
What a topic cluster actually is
One comprehensive page on a broad subject, surrounded by pages on its sub-topics, all linked in both directions.
- The pillar covers the whole subject and answers the broad query
- The spokes each cover one part in depth
- Every spoke links up to the pillar, and the pillar links down to every spoke
- Spokes link sideways where the connection is genuine
The structure does three things. It tells search engines the pillar is the primary page for the broad topic. It stops the spokes competing with each other for the same query. And it gives a reader a route from any entry point to whatever they actually needed.
The last one is not a bonus. A structure that only makes sense to a crawler is a structure you have built for the wrong audience.
Why it is under-used
Because the work is invisible and cumulative, and because most content is published one page at a time with no thought about what it should connect to.
The common failure is not bad linking. It is a set of pages with no relationship to each other, each covering an adjacent topic, none of them clearly the main one — which leaves a search engine to pick, and it often picks differently from how you would.
Anchor text
Anchor text is the description of the destination, and it is one of the seven sources Google uses to construct the title link for the page you are linking to. That makes it more consequential than most people treat it.
What works:
- Descriptive and natural — the diagnostic order for a sudden drop
- Varied across links to the same page, because pages are relevant to more than one phrasing
- Specific enough to stand alone — a reader should know where a link goes without the surrounding sentence
What does not:
- "Click here", "read more", "this article" — no information for anyone, human or machine
- Identical exact-match anchors on every link to a page, which reads as manipulation
- A whole sentence hyperlinked, which dilutes the signal and looks like a mistake
The test: read the anchor text alone. If it does not tell you what you would get, rewrite it.
Where links belong
In the body, in context. A link inside a sentence, at the moment the reader might want it, is worth more than the same link in a "related posts" block — to the reader and to the crawler.
Related-post blocks are weak links. They are template furniture, they appear identically on every page, and both readers and crawlers treat them accordingly. They are not useless; they are just not the work.
Early links carry a little more weight than late ones, though not enough to distort your writing over.
A practical range: two to five contextual links per article, more on a long piece. The real rule is that a link should exist because a reader might genuinely want it there, and the number follows from that.
Building a cluster from what you already have
Six steps. This is retrofitting rather than starting fresh, which is the situation most sites are in.
Step 1 — Group your pages by subject
Not by category as configured in your CMS — by what they are actually about. Most sites discover they have three or four real subjects and a scattering of unrelated pages.
Step 2 — Name the pillar for each group
The page that should own the broad query. Often it exists already; sometimes the broadest page is a thin overview that needs rewriting, and sometimes it does not exist at all.
Step 3 — Link every spoke up to its pillar
In the body, with descriptive anchor text. This is the step that does most of the work, and it is usually the one missing.
Step 4 — Link the pillar down to every spoke
The pillar should reference each sub-topic where it stops short and hand the reader onward. A pillar that does not link to its spokes is not a pillar — it is just a long page.
Step 5 — Add sideways links only where they are genuine
Spoke to spoke, where a reader on one would plausibly want the other. Do not manufacture these; a forced link is worse than no link.
Step 6 — Find and fix the orphans
Pages nothing links to. They are common, invisible, and it is the most fixable cause of a page sitting at "Crawled — currently not indexed" — covered in why isn't my page indexed.
Finding orphaned pages without a paid tool
Three approaches, cheapest first.
Compare your sitemap against your links. Any URL in the sitemap that nothing on the site links to is an orphan. A crawl of your own site produces the link list.
Check Search Console's Links report. Internal links, sorted ascending. The pages at the bottom with one or zero internal links are your orphans, and this takes about a minute.
Search your own site. site:yourdomain.com plus a topic shows what Google has indexed on it. Pages you expected and do not see are worth inspecting.
Then ask the harder question: does the orphan deserve a link? Sometimes the honest answer is that the page should not exist, and merging it into a better page is the right fix rather than manufacturing a link to it.
Common mistakes
Linking everything to the homepage. The homepage does not need help and rarely answers a specific query.
Nofollow on internal links. There is no reason to do this. It was once part of "PageRank sculpting", which stopped working many years ago.
Linking to a page that redirects. Update the link to the destination. Every hop is avoidable waste.
Hundreds of links in a footer. Sitewide link blocks were an old tactic and are transparently one.
Only linking to new content. Older pages that already have standing benefit from being kept in the structure, and they are frequently the ones that can pass the most.
Building the structure for crawlers only. If a link does not help a reader, it is decoration. This is also the check that keeps the rest of these rules honest.
Frequently asked questions
What is a topic cluster?
One comprehensive pillar page on a broad subject, surrounded by spoke pages covering its sub-topics, linked in both directions. It signals which page is primary for the broad query, stops the spokes competing with each other, and gives readers a route from any entry point to what they needed.
How many internal links should a page have?
Two to five contextual links in the body for a typical article, more for a long one. The number matters less than the placement — a link belongs where a reader might genuinely want it, and if that test is met the count takes care of itself.
What anchor text should I use for internal links?
Descriptive text that tells you where the link goes when read on its own. Vary it across links to the same page rather than repeating one exact-match phrase, and avoid "click here" or "read more", which carry no information for readers or crawlers.
Do internal links help SEO?
Yes, and they are the only such signal you control completely. They distribute authority between your own pages, establish which page is primary for a subject, and help crawlers discover pages. Anchor text is also one of the sources Google uses to build a page's title link.
What is an orphaned page?
A page nothing on your site links to. It is difficult to discover, receives no internal authority, and is a common cause of pages sitting at "Crawled — currently not indexed". Search Console's Links report, sorted ascending, finds them quickly.
Should I use nofollow on internal links?
No. There is no reason to. It derives from "PageRank sculpting", which stopped working many years ago, and applying it now simply discards a signal you were free to pass.
Are related-post widgets good for internal linking?
They are weak links. They appear identically across pages as template furniture, and both readers and crawlers weight them accordingly. Contextual links inside the body — placed where a reader might want them — do the actual work.
How do I fix a page that is not indexed?
Check internal links first. An orphaned page is the most common and most fixable cause, and adding contextual links from indexed pages on the same subject frequently resolves it without touching the page itself.
What to do next
Open Search Console's Links report, look at internal links, and sort ascending. The pages at the bottom are getting no support from the rest of your site.
Then pick your single most important page and count how many body links point at it. On most sites the answer is fewer than three, and fixing that costs an afternoon.
Related guides
- On-page SEO: the complete checklist — where internal linking sits in priority
- Meta titles and descriptions: write them for clicks — anchor text feeds the title link
- Why isn't my page indexed? A diagnostic — what orphaned pages cause
- How to refresh old blog posts that are slipping — relinking as part of a refresh
- Entity SEO: why named things beat keywords now — topical consistency at site level
Free: The 60-Minute Email Authentication Fix
A no-fluff checklist to set up SPF, DKIM & DMARC correctly and pass Gmail & Yahoo's sender requirements.
Muhammad Basim has worked in digital marketing since 2013, focused on email deliverability and AI-assisted content production. He is the author of The Email Deliverability Playbook and The Email Copywriting Playbook.
Related Articles
Email Deliverability: Why Authenticated Emails Still Land in Spam
Email deliverability is whether your message reaches the inbox rather than the spam folder, and it is decided by three factors: technical infrastructure, list quality, and sending behaviour. Authentication is one item inside the first factor. Getting it right is necessary, and it is nowhere near sufficient. That gap explains the most common complaint in […]
Linkable Assets: What Actually Earns Links
A link is a citation, and a citation requires that someone writing about your subject needed you to make their point. That is the whole mechanism, and it is the reason most "linkable content" earns nothing. The test, before you build anything: Could a writer covering this topic finish their sentence without referencing you? If […]
Link Outreach Emails That Get Replies
Outreach fails for exactly two reasons, and only one of them gets written about. The first is that the email was not worth replying to. That is the reason every guide addresses, and the advice — personalise, be brief, offer value — is correct and insufficient. The second is that the email never arrived. Nobody […]