A pile is not a library
Fifty unconnected articles are fifty isolated pages. The same fifty, cross-linked so each points to the others that extend it, form a structure that signals which page owns which topic and how the subjects relate.
Links teach relationships
An engine building a picture of what you are authoritative about uses the connections between your pages as evidence. This is the practical mechanism behind making your brand legible as an entity.
Internal links are the only authority signal you fully control.
Link in the prose, not in a footer list
A link inside a sentence carries context about why the other page is relevant. A “related posts” strip carries none, and readers ignore it — a link is worth most where a reader is already thinking about the thing it points to.
Hub pages do the heavy lifting
A page per topic that links to everything in it gives both readers and crawlers a route to every article, which matters increasingly as a library grows past what one index page can hold.
Point the depth at the money pages
Articles should link to the service they support, not only to each other. That is what converts a content library from a traffic exercise into something that feeds the pages buyers compare.
Validate them, or they rot
Links break when pages are renamed, merged, or pruned. Checking them automatically rather than manually is what makes a large library maintainable — and it is precisely what content pruning would otherwise quietly break.