You can’t be a student at Hogwarts without getting placed in one of the four main houses. The Sorting Hat ultimately decides your fate, putting you into either Gryffindor, Hufflepuff, Ravenclaw, or Slytherin. Where people end up is based on their attributes, with things like intelligence, bravery, and cunning affecting your fate. Although J.K. Rowling

It was 1997 when the first Harry Potter book was published. Since then there have been hundreds of fan theories about the series. Some of them make quite a lot of sense and some of them are seriously odd. Even Rowling herself enjoys reading about the different theories and commenting on the possibility of them