Choose one naming style
Small differences can create big messes. For example, one album might show the artist as The Weeknd, another as Weeknd, and another as The Weeknd feat. someone else. Decide how names should appear and keep that style consistent.
Fix albums before individual playlists
Albums are the structure of a music library. Before building playlists, make sure each album has a consistent title, album artist, year, track order, and cover image. Once albums are clean, playlists become easier to manage.
Use genre tags with restraint
Genre tags are helpful when they are simple and consistent. Too many small variations can make filtering harder. Instead of using dozens of nearly identical genres, choose a smaller set that matches how you actually browse music.
Check search and sorting
After editing tags, search for an artist, open an album view, and check track order. If the library looks right in those three places, the metadata is usually in good shape.