Harry Potter is arguably the biggest cultural phenomenon of the last 25 years. Since the first book was published in 1998, J.K. Rowling has published six more books on top of three companion pieces to the franchise: Quidditch Through the Ages, Fantastic Beasts and Where to Find Them, and The Tales of Beedle the Bard. A couple of years later, a theatrical script, Harry Potter and the Cursed Child, was published by Rowling, and Thorne and John Tiffany, and it's still on stage in a West End production in London. What's more, the books were adapted into eight iconic films and a spin-off trilogy.
Source：https://www.cbr.com/harry-potter-books-ranked/
