Man I just gave you an explanation of what each setting does
I guess I did sort of gloss over camber and toe. Camber affects your steering authority, once you're in a turn and the weight has shifted laterally, a wheel with negative camber will make better contact with the surface and have more grip. Think about it like this:
No camber looks like this: || ||
And when you make a turn to the right, the weight transfer will make it do this: \\ \\
All the force is on the outside of the wheel, and your grip is compromised.
Now if your wheels are set up with negative camber, it'll look like this: // \\
If you take that right turn again, they're going to look like this: || \\
Now it's not making a big difference on the inside tire, but it doesn't have the majority of the load so it's not that important. You can see though, that the weight transfer is pushing the entire tire into the ground and giving you much better grip on the outside though.
Toe in on the rear just gives makes the tail tend to stay where it is rather than continuing to slide around wherever it like, sort of a centering force.
What else are you not understanding? I can try to explain better if you have specific questions.