I use MAL Sync and MangaUpdates to track what I am reading.
https://malsync.moe/
https://www.mangaupdates.com/
That seems like a useful tool, but it looks like there are works (and other information) on MangaDex that are not on the other sites. I wish there was some sort of
MusicBrainz-style database for manga that could serve as a single source of truth, but as far as I'm aware, that sadly doesn't exist (or at least isn't used by MangaDex).