Isn't it funny how it's always for a school project, or your friend wants the information and you're just passing it along.
Hacking is not totally illegal. it is frowned upon alot, but that's because people imagine a spotty teenagerm glued to their monitor at 4am in the morning in a dark room.
There are many forms of hacking, cracking etc. Maybe you could be a bit more descriptive with "Hacking" ?
Use your favourite seach engine to find the results your after. A personal fav of mine is www.google.co.uk