n00b and need help, please

Hello,
I'm new to this scene and i have a lot of questions about some things i just cant figure out. Dont just tell me to look for it on the forums or search google because i've tried that and the only thing that happened was my mind exploded. Or i couldnt find what i needed. And the info was really outdated. I hope u all can help. Ok, here are my questions:

1) Exactly which PS3s are compatible with any kind of jailbreak (and by exactly, i mean all the info about the console, the numbers, everything) and out of them, which ones have backwards compatibility (or can be made backwards compatible through the jailbreak)
2) After jailbreaking, is accessing PSN or PS Store possible, or are other means nessesary
3) What are all the advantages to jailbreaking
4) After jailbreaking the console, is it possible to remove the jailbreak and revert the console back to normal
5) What are all the different ways to jailbreak the console and which ones are the easiest and least likely to brick the console

These are all the questions i have for now, i'll post more if i have them