Fixing every crawl error is the wrong goal. The aim is not an empty report; it is zero errors that actually matter, because a great many of the entries Search Console shows are expected outcomes rather than problems. Chasing the count to zero spends real time on URLs that were never meant to be live, and it mistakes a tidy dashboard for a healthy site. Worth follows whether a URL should be indexable, not the size of the error list.
The triage is a single question asked of each URL: should this exist and be in search at all? A 404 on a page you deliberately removed is the system working as intended, and Google expects pages to disappear as sites change. An intentional block on an admin path, a deliberately retired page, a parameter URL you never wanted indexed; all of these are noise, and Google itself recommends fixing only the 404s you link to yourself or list in your sitemap. The presence of an error is not, by itself, a reason to act.
What flips a 404 from noise to worth fixing is a reason the URL should still resolve. It collected backlinks that you are now leaking, in which case a redirect preserves the equity. Internal links still point at it, sending users and crawlers into a dead end, in which case the links get updated. It was pulling real traffic, in which case its disappearance is an actual loss. Absent one of those, the error can sit.
So the reader sorts the error list by whether each URL should exist and be indexable before fixing anything, repairing the ones that should be live and leaving the expected ones alone rather than driving the number down just to clear it.