Only one internal link points here
What this means
Exactly one other crawled page links to this URL. It is reachable, but it sits at the thin end of the internal link graph. For a genuinely peripheral page, one link is the right amount.
How to fix it
If the page matters, link to it from related content or a hub page; if it is peripheral by design, no change is needed.
Fix effort
This check needs review: the change can be drafted for you, but a person has to approve the wording or choose the target before it ships.
Authoritative source
https://developers.google.com/search/docs/crawling-indexing/links-crawlable
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