Your own list of tracks, private or shared with the household.
In Broadcast: Library, Music, Playlists.
In Classic or Neu: Library, the Music tab, Playlists.
Yours, and the ones others in the house shared.
Type a name and press New playlist. Share with everyone lets the household play it (only you can change it).
On any track, album or artist, the … menu has Add to playlist. An album adds its tracks in order; an artist adds their top 20. In the player, Save as playlist turns the whole queue into one.
On a playlist: play, shuffle, drag tracks into order, rename it.