this isn’t really the right venue to discuss such a broad and expansive topic. your best bet would be to look through one of the introductory neurosurgery textbooks mentioned on this site, or even peruse ”neurosurgical focus,” an online repository of up-to-date information regarding all aspects of neurosurgery. googling may work as well.
once we get more people contributing to our wiki, this site may be more useful from an informational standpoint. until then, we all have to read and research the old-fashioned way.