First, you'll need to download the YouTube Music app on your Android device and sign in with your Google account. Next, you'll need to open the Android Auto app and navigate to the settings menu, where you can select YouTube Music as one of your available music services. This will allow you to access your YouTube Music library and playlists directly from the Android Auto interface.
One of the best things about using YouTube Music with Android Auto is the ability to access millions of songs, albums, and playlists with just your voice. You can use the "OK Google" command to search for specific artists, songs, or playlists, and even create new playlists on the fly. This makes it easy to discover new music and enjoy your favorite tunes while keeping your eyes on the road and your hands on the wheel.