My aunt and cousin recommended the Harry Potter books to my mother and I. She started reading them to me and we both loved the story. As I got older and became a better reader, we started taking turns reading chapters to each other. Harry Potter was the first thing my mom and I shared.
The books will always be my favorite part of the phenomenon, though some of the movies are solid adaptations. They're everything a kid wants in a story. Every once in awhile I'll go on a Potter binge and pick up a few or more of the books to reread some of my favorite parts.
Harry Potter is the fandom I'm most passionate about, alongside Batman. Like all the other HP fans, I love how it created such an awesome community of fans.