Ah ok then. I guess it comes with experience from when you have to go into the registry?
Mainly, I just want to be able to say "Oh, to do x, y and z you need to change this key's value from 0 to 1." I can do this on a basic level, with very basic stuff, but it has interested me into wanting to learn more.
Also, say, removing viruses just understanding what keys shouldn't really be there.