Is cydia safe? It's a website I want for my iPhone?

Http://cydia-download.org/i/

Cydia itself is safe. Its the process of getting cydia that is risky. Cydia is basically the app store for jailbroken products. You will get cydia automatically if you jailbreak your iphone. Jailbreaking goes just fine 99% of the time but there's a risk you can ruin your iphone in the process of jailbreaking it. And apple will not help you. So its at your own risk. Also jailbreaking the iphone isn't illegal but there are illegal things that you can do with jailbreaking (like stealing apps or getting stuff for free) so just beware of that too. I jailbroke both of my ipods and it went just fine, the only thing I don't like about it is that it slows down my ipod touch 4g a lot.

Ps: if you do choose to jailbreak it i recommend the latest version of absinthe