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
Magic in Harry Potter
In J. K. Rowling's "Harry Potter" series, magic is depicted as a supernatural force that can be used to override the usual laws of nature. Many fictional magical creatures exist in the series, while ordinary creatures also sometimes exhibit magical properties. Magical objects are also described. The small number of humans who are able to perform magic (witches and wizards) refer to the rest of the population, oblivious to the existence of magic, as "Muggles" in the United Kingdom and "
Harry Potter
Harry Potter is a series of fantasy novels written by British author J. K. Rowling. The novels chronicle the lives of a young wizard, Harry Potter, and his friends Hermione Granger and Ron Weasley, all of whom are students at Hogwarts School of Witchcraft and Wizardry. The main story arc concerns Harry's struggle against Lord Voldemort, a dark wizard who intends to become immortal, overthrow the wizard governing body known as the Ministry of Magic and subjugate all wizards and Muggles (non-magical people).