[Cressi]

I still don't understand reputation. I assume is has to do with hacking something?

Reputation is given to members by other members to show that you've done something helpful, good or that you're just awesome (assuming the reputation is positive, which it by no means has to be).

You can give reputation by accessing the user's profile page (sinister.ly/user-"username"), scrolling down to "Reputation" and clicking "Rate".
You can as a registered member rate someone +1, neutral or -1.

Yes, it can have something to do with Hacking, but anything else you feel worth rep:ing aswell ^^