    As expected, Harry turned out to know very little about the magical world. What he did know he’d mostly gleaned from the pages of his textbooks. Ron took it upon himself to teach Harry all about Hogwarts. He told Harry about the headmaster, Professor Dumbledore, how he was one of the greatest wizards alive. He told Harry about the castle and the lake, the giant squid that he’d heard lived in the lake, and about all the different things they were going to learn.