See the whole problem before you fix any part of it.
It’s easy to react to the first broken thing you notice, a handful of missing tracks, say, and dive straight into fixing just that. But libraries rarely break in one place at a time. A drive change or a folder rename can leave broken references scattered across your database, folders, playlists, and history all at once.
A Healthcheck is a read-only scan, so it costs you nothing to run. It gives you the full picture first: what’s actually broken, and where, before you decide what order to tackle things in. Run it before you start a repair session, and run it again afterwards to confirm the library’s actually clear, not just quieter in the one spot you were looking at.
Read the Healthcheck docs · See the Typical First Repair Flow