Internal Linking

Internal links - links between pages on your own site - are the most underrated lever in SEO. Unlike backlinks, you control them completely; unlike content production, changing them is cheap. They do three jobs at once: discovery (crawlers find pages by following links), authority flow (link equity distributes through them), and meaning (anchor text tells engines what the target page is about).

How link equity flows#

Every page accumulates authority (from external links and its own quality) and passes a share of it through its outgoing links. Three practical consequences:

1. Pages linked from your strongest pages get a boost. Your homepage is usually your strongest page - what it links to matters.
2. Orphan pages (no internal links pointing to them) are nearly invisible: hard to discover, no equity, weak ranking. Every page in your sitemap should be reachable by links.
3. Click depth matters. Pages buried 5+ clicks from the homepage are crawled less and rank worse. Important pages belong within 3 clicks.

Anchor text#

The clickable text of a link is a direct relevance signal for the target page:

<!-- weak: no information -->
Learn more <a href="/guides/crawl-budget">here</a>.
 
<!-- strong: tells engines & users what the target is about -->
See our guide to <a href="/guides/crawl-budget">crawl budget optimization</a>.

• Use descriptive, natural anchors that contain or paraphrase the target's primary keyword.
• Vary phrasing across the site - identical anchors from a hundred pages look templated and convey less.
• Never sacrifice sentence readability for anchor optimization; rewrite the sentence instead.

Linking patterns that work#

Hub and spoke#

The topic cluster pattern: pillar links to every spoke, spokes link back and to relevant siblings. This concentrates topical signals and equity inside the cluster.

Contextual body links#

Links inside paragraph text outweigh boilerplate (nav/footer) links. As a habit, every new article should:

• Link out to 2–5 related pages where genuinely relevant
• Receive links in from 2–5 existing related pages - edit old posts when publishing new ones. This second half is the step everyone skips.

Strategic boosts#

Need a money page to rank? Add contextual links to it from your highest-authority pages (check "Top pages by links" in Ahrefs/GSC). This is often worth a position or two on its own.

Technical hygiene#

• Plain <a href> links. Buttons with onClick navigation are invisible to crawlers - see JavaScript SEO. Next.js <Link> renders a real anchor, so it's safe.
• Don't nofollow your own links - it discards equity without benefit.
• Fix broken internal links and redirect chains during audits; each chain hop wastes crawl budget and leaks equity.
• Breadcrumbs (with BreadcrumbList schema) add consistent structural links and a SERP enhancement for free.

Auditing your link graph#

A crawler (Screaming Frog) gives you the full internal picture:

On-page module complete. Next: Technical SEO, beginning with the machinery of crawling and indexing.