A couple years ago I found that site... I tried some of the stuff on it but either it didn't work or it was completely useless.

If you want to learn about security, you would do better to spend time on AO reading tutorials and asking questions, setting up a Linux box and learning about it, and maybe learning a programming language if you already haven't. I think you will learn a lot more doing this than you would performing trivial tasks that make you feel like you are actually hacking.
I think you understood me wrong, I mean that it is useless crap for anyone older than 14.
It was useful for me because the English Carolyn uses is easy, and when I was still younger I couldn't understand very well the things on most other sites. (English is not my native language he)