The first movie in the expanded Harry Potter universe is Fantastic Beasts and Where to Find Them, which made over $800 million in 2016. But it doesn't matter how much people love a movie; Screen Junkies will find a way to turn that enthusiasm on its head with an Honest Trailer.
Fantastic Beasts and Where to Find Them is set in the 1920s, earlier than the Potter films, and is supposed to set up a series of several movies based on wizards in America. I don't think there's spoilers in this Honest Trailer. I haven't seen the movie, and I still have no idea what the plot entails.