Sure, here are some Spotify playlist hacks that you might find useful:

1. **Collaborative Playlists**: You can create a playlist and then make it collaborative, which allows your friends to add, delete, and reorder the tracks.

2. **Organize Playlists into Folders**: If you have a lot of playlists, you can organize them into folders. Just go to "File" > "New Playlist Folder" or use the shortcut "CTRL + SHIFT + N" on Windows or "CMD + SHIFT + N" on Mac.

3. **Discover Weekly and Release Radar**: Don't forget about these two playlists that Spotify automatically curates for you. Discover Weekly is a great way to find new music that is similar to what you already listen to, and Release Radar shows you new releases from your favorite artists.

4. **Sort and Filter Playlists**: You can sort and filter the songs in your playlists. Click on the "Title", "Artist", or "Album" headers to sort. You can also use the filter function (the magnifying glass icon) to quickly find a specific song.

5. **Use Playlist Description**: You can add descriptions to your playlists. This can be especially useful if you're sharing the playlist with others.

6. **Recover Deleted Playlists**: If you accidentally delete a playlist, you can recover it. Go to your account page on Spotify's website, click on "Recover playlists" in the menu on the left, and then click "Restore" next to the playlist you want to recover.

7. **Use Private Session**: If you don't want your friends to see what you're listening to, you can start a private session. Go to the dropdown menu next to your profile name and select "Private Session".

8. **Drag and Drop**: You can easily add songs to a playlist by dragging and dropping them from your library or another playlist.

9. **Crossfade Songs**: You can make your playlists sound more professional by crossfading songs. Go to "Settings" > "Playback" > "Crossfade songs", and adjust the slider to your liking.

10. **Use Playlist Cover Art**: You can customize the cover art of your playlists. Just click on the playlist cover and then click "Choose Image".