Necromancy is not forbidden, and it can be learned through various books or taught by other more experienced necromancers.
It is an older practice so I wouldn't doubt that a good bit of it is generally written down I scriptures or handed down within a coven/family.
yes that is true,but sometimes when i ask of people to teach me such think,they only say NO.they say why would you want to bring the dead back to life.why would the say that necromancy is like shamanism whats the difrence?
You do not bring the dead back to life in necromancy. As Nevermore said, it is a form of divination. The people who say it is bad are ignorant of what it really is or are closeminded. Those who will not teach you probably don't have time or do not know enough about is to teach you. You can also always teach yourself.
h.p. Lovecraft wrote the necronomicon. total fiction :) but hey wouldn't be the first time someone used fiction as a basis of spiritual beliefs...scientology... conceived by another great science fiction author l. Ron Hubbard!