Sleeptimer
If you set a sleep timer you will easily find your way back even if you happen to fall asleep while listening. To set the sleep timer, open your book in the Player and click on the moon symbol. Choose for how long you want the audiobook to play before stopping.
Manual bookmarks
If you find a place in a book extra interesting, and want to be able to find your way back to it later, you can add a manual bookmark and include a note.
To add your bookmark, open your book in the Player in the app and click on the bookmark symbol.
Speed settings
Do you want to slow things down while listening, or speed it up? If you open the Player in the app and click on the 1.0x symbol, you can choose which speed you want to listen to.