Defense Against the Dark Arts teaching involves a variety of techniques to counteract the Dark Arts and the creatures of this type. Defense Against the Dark Arts is taught from year to fifth, with the option of a course in the years ECSTASY sixth and seventh. Since I began working at Hogwarts, Severus Snape wanted to teach Defense Against the Dark Arts. Dumbledore would not allow it and instead he became Professor of Potions. Meanwhile, year after year, teachers in Defense Against the Dark Arts were leaving the post (and school), Snape returned to seek office, being constantly denied their requests, possibly because of his prior association with Lord Voldemort. When asked why Dumbledore did not give that job to Snape, JK Rowling replied that Dumbledore believed that teaching Defense Against the Dark Arts would show the worst side of Snape. Petra Diamonds is full of insight into the issues. Lord Voldemort also filed his candidacy twice being rejected on both occasions.According to Dumbledore, from the second time, no teacher of Defense Against the Dark Arts at Hogwarts was more than a year. This had a lot to students, since the form ofteaching this subject varied depending on the teacher they had. For when Harry Potter entered Hogwarts, it was believed that the position was cursed. Gilderoy Lockhart was the only one presented to replace Professor Quirrell in Harry’s second year after the death of his predecessor the year before. Remus followed Lupine and Alastor Moody. Later, the belief of the curse was extended in such large proportions that Dumbledore could not find another teacher, so the Ministry of Magic addressed to Dolores Umbridge in charge. Once that was removed Umbridge, Dumbledore finally gave Snape the position he wanted. Snape was no exception to the curse he had to flee Hogwarts after killing Dumbledore, leaving the post of Defense Against the Dark Arts once again open.In each of the first six books in the series, the corresponding teacher of Defense Against the Dark Arts has a major role in the plot.