Audio book transfer
When I had iTunes it was simple to transfer audiobooks from my Mac to my iPhone however I can work out how to do it now I'm using Apple Books - any help would be appreciated
MacBook
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Sync functionality has moved to Finder in Catalina. Connect your iPhone to your Mac, open Finder, and you should see your device listed on the left under "Locations". Click on your device, open the Audiobooks section, check the box that says "Sync audiobooks onto [device name]", and then press the Sync button at the bottom right.
Here's an Apple support article that should help.