I so love Harry Potter and the JK Rowling books
Yes, The novels chronicle the life of a young wizard, Harry Potter, and his friends Hermione Granger and Ron Weasley
Yes,  and they have a wonderful friend in Dumbledore
Yes, is the headmaster of the wizarding school Hogwarts.
Yes,  They had to fight so many bad creatures
Lord Voldemort and his followers, the Death Eaters, are quite scary
Oh yes.  And they had the ghost who lived in Hogwarts too
Many fictional magical creatures exist in the series, while ordinary creatures sometimes exhibit new magical properties