There are a ridiculous amount of side quests in Hogwarts Legacy, some of which are a lot more involved than others. One of the more straightforward ones is called "Flying off the Shelves" and requires players to track down five flying books for a young Gryffindor named Cressida Blume. It can be triggered in the Central Hall once players have reached Level 2, though the bulk of the action actually takes place in the nearby library.