Caster affects stability and steering. more positive caster (the kingpin basically leaning back towards the rear of the car) means the car will be more stable, but it'll also be a slug when it comes to steering. the closer to vertical the caster is, the more responsive your car will be.

Camber affects overall grip during cornering. the overall attempt when adjusting camber is to have the tire perpendicular to the racing surface while going around a corner so you can have the most grip possible