How do I add a playlist?

See:

How to make a playlist in the Apple Music app - Apple Support

Sync your iPhone, iPad, or iPod using your computer - Apple Support

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1. Open the Apple Music app.
2. At the bottom of your screen, tap Library.
3. Tap Playlists.
4. Tap New Playlist.
5. Give your playlist a name, then tap Add Music.
6. Find the music that you want to add.

• On iPhone or iPod touch, tap the music you want, then tap Done. If you add music directly from the search box, hit Cancel, then tap Done.
• On Android, tap the music you want to add, then tap Don

[Link Edited by Moderator]