1. Connect your iPod to your computer with a USB cable.
2. Open the File Explorer (on Windows) or Finder (on Mac).
3. Find the music files you want to transfer to your iPod on your computer.
4. Drag and drop the music files from your computer to the iPod's Music folder.
Sync music with a media player other than iTunes
1. Install a media player that supports iPods, such as Winamp, MediaMonkey, or foobar2000.
2. Connect your iPod to your computer with a USB cable.
3. Open the media player and select your iPod as the target device.
4. Select the music files you want to transfer to your iPod from your media player's library.
5. Click the "Sync" button to transfer the music files to your iPod.
Use a third-party software
There are several third-party software available that can help you transfer music to your iPod without iTunes, such as iExplorer, SynciOS, or AnyTrans. These software usually provide more features than the manual file transfer method and the sync with media player method, such as the ability to transfer DRM-protected music or transfer music to an iPod that is not authorized by your iTunes account.