I usually find music through youtube or spotify. for youtube it's music videos, singles, and even full albums. spotify playlists have introduced me to a lot as well.
I like listening to the entire discography after discovering the popular/hit songs from that artist/band. For metal bands I for sure like listening to each album in it's entirety starting from their first LP to their latest. For pop/rap music I don't dig too far honestly, usually the hit songs are the best songs.
If you want to understand how a band's sound has changed through the years, then you need to hear their evolution through albums, starting from the beginning.
obituary's first album
their 2023 release.
some bands have a really mixed bag discography in terms of quality/style, so in those cases I just listen to whatever I think I will like, and then check out the "filler" later.