You can do a little bit of everything. (Can use unlearned skills without the -2 penalty)
Prerequisite: Craft 15
An excellent skill to get if your Knowledge is low as it'll allow you to use any skill in the game without the usual penalty for unlearned skills. It also allows skills such as Investigation and Science to be accessed from the 'use skills' menu. While not as effective as actually learning the skills, it does make your character very flexible.