Internal linking: the underrated SEO tactic

Internal links are the highest-leverage SEO improvement most sites ignore. They cost nothing to implement, they pass authority between your pages, they help search engines understand topic relationships, and they keep visitors on your site longer. The hub-and-spoke model is the most effective structure, and most sites underutilise it by a wide margin.

Why internal links matter

Internal links serve three distinct functions. First, they distribute link equity — the ranking authority a page has — across your site. Pages with more internal links pointing to them tend to rank higher for their target keywords, all else being equal. Second, they create a crawl path for search engines. A page with no internal links pointing to it is an orphan page, and orphan pages do not get indexed or ranked reliably regardless of content quality. Third, they guide visitors toward commercial pages. An article that links to a relevant service page transforms informational traffic into commercial traffic.

The impact is measurable. When a site adds a systematic internal linking structure — where every article links to two relevant service pages and one related article — the site-wide authority flow improves, and the pages receiving the new links typically see ranking improvements within weeks. There is no other SEO activity with this return on effort.

Hub-and-spoke model

The hub-and-spoke model organises content around a central pillar page. The hub covers a broad topic comprehensively. The spokes are detailed pages on specific subtopics, each linking back to the hub and to two or three sibling spokes.

A practical example for a web design company: the hub page is /website-design/, covering the full scope of design services. Spoke pages include /website-design/redesign/, /website-design/wordpress/, /website-design/landing-pages/ and /website-design/ux-ui/. Each spoke discusses its subtopic in detail and links back to /website-design/ with contextual anchor text. Search engines see a cluster of pages all referencing each other around a central theme, which boosts the topical authority of the entire cluster.

The same model applies to blog articles. A pillar article about SEO links to detailed articles about keyword research, internal linking, schema markup and technical SEO. Each detail article links back to the SEO pillar. The pillar article ranks for the broad term, the spokes rank for specific long-tail variants, and the cluster captures traffic at every level of specificity.

Implementing the hub-and-spoke model requires planning but no technical skill. Identify your broadest topic, build the pillar page, then create the spoke pages in priority order. Link from the hub to each spoke and back from each spoke to the hub. The structure itself, more than any individual link, is what signals topical depth.

Anchor text best practices

Anchor text — the clickable words in a hyperlink — tells both readers and search engines what the target page is about. Descriptive anchor text is one of the strongest relevance signals you can send.

Use the target page's primary keyword or a close variant for about a third of the links pointing to it. For the remaining links, use natural phrases like "read our guide on", "learn more about", or partial matches. A page whose every inbound link uses identical anchor text looks manufactured and may trigger spam filters.

Three rules: never use "click here" or "read more" as anchor text — those tell search engines nothing. Keep anchor text under five or six words. And ensure the anchor text reflects the destination page, not the page you are linking from. A link that says "how much a website costs" should point to a cost page, not a portfolio page.

Link depth

Link depth measures how many clicks from the homepage it takes to reach a page. A page linked directly from the homepage has a depth of one. A page linked from that page has a depth of two, and so on. Authority diminishes with each click because it passes through intermediate pages that dilute it.

Audit your site's link depth regularly. Every commercially important page — service pages, pricing, portfolio, key articles — should be within three clicks of the homepage. If a service child page is five clicks deep (homepage to services pillar to services hub to category to the page), add direct links from the services pillar or from articles to bring it closer.

Breadcrumbs reduce perceived depth for users but do not reduce link depth for search engines. Breadcrumb links are typically treated as structural rather than editorial links, which means they carry less authority weight than in-content links. Use breadcrumbs for usability, but rely on contextual body links for authority flow.

Tools to audit

Auditing internal links does not require expensive software. Screaming Frog SEO Spider (free for up to 500 URLs) crawls your site and produces a complete link map showing every internal link, its destination, anchor text, and the link depth of every page. The report highlights orphan pages, pages with zero internal links, and pages with excessive link depth.

Google Search Console's Links report shows which pages on your site have the most internal links pointing to them. If your most-linked pages are not your most commercially important pages, that is an alert that your linking structure needs attention.

For ongoing maintenance, run a monthly crawl. Any page with fewer than two inbound internal links gets flagged for remediation. The fix is usually simple: a contextual link from a relevant article or service page. Over six months, this habit alone measurably improves the ranking performance of pages that were previously underlinked.