Hogwarts has arguably been my favorite magical school. Hogwarts: An Incomplete and Unreliable Guide, the third in the Pottermore Presents series, provides, much like its predecessors little bits and pieces of the wizarding world.
Can you enjoy the series without reading this? Sure you can. Can you enjoy Hogwarts without reading this guide? Absolutely.
But if you don't want the magic to stop and don't mind the fact that it is rather short and offers only some new information, give it a try. Since I never ventured into Pottermore, I don't know if it holds anything new for users of Pottermore.