A page nobody links to internally is functionally invisible, no matter how good the content is. TechySEO maps every internal link on your site, by source, destination, and anchor text, so you can see exactly which pages are starving for link equity and which ones are hogging it through a navigation menu nobody questioned.
Every internal link is a small transfer of authority from one page to another. Skip linking to a page entirely and it gets none of that, regardless of how good the content actually is or whether it's sitting right there in your sitemap. Sitemaps tell Google a URL exists. They don't tell Google the URL matters.
The opposite mistake is just as common and less obvious: a page linking out to 500 other pages is spreading its authority so thin that each individual link carries almost nothing. Twenty deliberate links from a strong page will move more equity than five hundred links from the same page ever could.
Internal linking is the distribution layer for whatever authority you've already earned. Build great backlinks to a homepage that doesn't pass any of that equity onward, and you've built a reservoir with no pipes leading out of it.
Not a guess based on your nav menu. The graph built from links the crawler actually found.
Build the full link graph and find the orphan pages, the dead ends, and the buttons that look like links but aren't, all in one pass.
