A camber kit is actually a pretty easy thing to understand.

For the rear, some people use washers as a cheap way of adjusting it, or you can buy a camber kit from Ingalls, spc, etc. It looks like this



You can adjust it so that it pushes the top of the wheel out further(positive camber) or so that it tucks the wheel towards the inside (negative camber). Works the same way for the front but looks different. Pretty much the same principle, pushing out or pulling in to set the desired amount of camber on the vehicle.

Understand?