These are a few questions people ask me about jailbreaking
Q - What is a jailbreak?
A - A jailbreak is a Customized Firmware (CFW) where you have access to the game inside therefore you can mod the games by replacing the game save, with a custom one.
Q - Can I jailbreak my PS3?
A - If you are on firmware 3.55 or lower, yes, otherwise no.
Q - I'm on 4.55, is there a way to downgrade?
A - Yes, it requires an E3 Flasher and opening your PS3.
Q - What's a CID?
A - Its a Console ID and if it gets banned you can buy them cheap.
Q - How do I jailbreak?
A - If you are on 3.55 you do it with a USB.
Q - What CFW do I pick?
A - If you are wanting to mod games like most people, then 4.46 Rebug is recommended.
If you have anymore question feel free to ask.