Internal Linking Strategy: Boost Your SEO Rankings
Picture two pages on your site. One is your homepage, which every other page links to. The other is a detailed guide you published 14 months ago that exactly one archive page links to, four clicks deep from the homepage. Both might be equally good. Only one of them will rank, and it isn't because of the writing. Internal linking is how authority and crawl attention flow through a site, and most sites leak both by accident.
This post is about the mechanics: how links move PageRank and shape crawl paths, why anchor text and click-depth matter more than link count, and how to find the pages your structure is starving. For the wider context of where internal linking sits among titles, schema, and canonicals, see the on-page SEO checklist.
What a link actually passes
Google's original PageRank model still describes the intuition well: a page has a certain amount of authority, and it divides that authority among the pages it links to. A page with 100 units of authority linking to 10 pages passes roughly 10 units down each link (the real model is dampened and more complex, but the proportion is the point).
Two consequences fall straight out of this:
- Where a link comes from matters more than that it exists. A link from your highest-authority page is worth many links from weak ones. This is why pointing your homepage and top-traffic posts at the pages you want ranked is the highest-leverage move.
- Adding more links to a page dilutes each one slightly. Not a reason to fear linking (the user value of a relevant link almost always exceeds the tiny dilution), but it is why a sitewide footer stuffed with 80 links passes very little through any single one.
Crawl paths and depth from home
Authority is half the story. The other half is discovery. Googlebot finds pages by following links, and it doesn't crawl infinitely; it allocates a budget. Two structural facts drive how well your pages get crawled and indexed:
- Click depth. The number of clicks from the homepage to a page is a rough proxy for how important Google thinks it is. Pages three or fewer clicks deep get crawled often and reliably. Pages six clicks deep get crawled rarely and can fall out of the index. If an important page is buried, the fix is a link from a shallow page, not more content.
- Crawl paths. A page reachable only through paginated archives ("page 14 of the blog") is technically linked but practically stranded. Flatten the path with hub pages and contextual links so important content sits near the top of the tree.
You can see your own depth distribution in Google Search Console's page indexing report; pages listed as "Discovered – currently not indexed" are frequently just too deep or too weakly linked.
Anchor text: descriptive, not "click here"
The clickable text of a link tells Google what the destination is about. This is a genuine ranking signal for the target page, and it costs nothing to get right.
| Anchor text | What it tells Google |
| --- | --- |
| click here | Nothing about the destination |
| read more | Nothing about the destination |
| our pricing page | Weak, generic |
| canonical tags and duplicate content | Strong, names the topic |
Write the anchor as the words a person would use to describe the page they're about to visit. Two cautions: vary the wording naturally rather than pasting the identical exact-match phrase into 50 internal links (it reads as manipulation), and never use the same anchor to point at two different URLs; you're telling Google two pages are the same thing.
Hub-and-spoke structure
The pattern that organizes all of this is the hub (or pillar) and its spokes:
- A hub is a broad page covering a topic at survey level; for this blog, the on-page SEO checklist is the hub.
- Spokes are the deep-dive pages: title tags, alt text, canonicals, this very post.
- The hub links down to every spoke; every spoke links back up to the hub and sideways to closely related spokes.
This does two things at once. It concentrates authority on the hub (which collects links from all the spokes) so the hub can rank for the broad competitive term, and it gives each spoke a shallow, well-linked path so it gets crawled and ranks for its specific term. The cluster also signals topical depth: a clear set of interlinked pages on one subject reads as expertise.
Finding orphan and under-linked pages
An orphan page has zero internal links pointing to it. It can only be discovered through the sitemap or external links, receives no internal authority, and routinely underperforms or never indexes at all. Under-linked pages are the milder version: a few links, but none from strong pages.
To find them:
- Crawl your site (Screaming Frog, Sitebulb, or any crawler) and cross-reference the crawl against your sitemap; URLs in the sitemap that the crawler never reached by following links are orphans.
- In Search Console, look for valuable pages with very few impressions despite good content; weak internal linking is a common cause.
- Run a
site:yourdomain.com topicsearch to find existing pages that could host a contextual link to the starved page.
The fix is always the same: add a contextual, descriptively-anchored link from a relevant, well-linked page. One good link from a strong page usually does more than ten from weak ones.
Frequently Asked Questions
How many internal links should a page have?
There is no fixed limit. Add as many as are genuinely useful to the reader and stop there; a long guide might have 15 contextual links, a short post three. The number to watch is not "too many" but "too few from strong pages" pointing at the URLs you want to rank.
Do internal links pass PageRank like external links?
Yes. Internally, a link passes authority the same way an external one does. The difference is you control every internal link, so you can deliberately route authority from strong pages to the ones that need it, which you can't do with backlinks.
Should internal links be nofollow?
Almost never. nofollow on an internal link wastes the authority that link would have passed and gives no benefit. The old tactic of "PageRank sculpting" with nofollow stopped working in 2009. Reserve it for links you genuinely don't vouch for, like user-generated content.
What is click depth and what's a safe number?
Click depth is the fewest clicks from the homepage to reach a page. Keep important pages within three clicks. Pages deeper than that get crawled less often and are more likely to be dropped from the index, regardless of quality.
Are footer and sidebar links as valuable as in-content links?
No. Sitewide footer and sidebar links appear on every page, so each one passes very little authority and Google discounts boilerplate links. A single contextual link inside the body of a relevant article is worth far more than a footer link repeated across the whole site.
How do I fix an orphan page?
Add a contextual link to it from a relevant page that is itself well-linked, ideally a hub page or a high-traffic post. Listing it in the sitemap helps discovery but doesn't pass authority; only an actual internal link does that.