This is a question asked in many IRC channels and forums. You won't get the answer.

The problem is that in many territories you are asking people to break the law by instructing you on how to commit an offence yourself.

The internet is upheld by individuals who refer to themselves as hackers. These are people who know an immense amount about computers and their interraction. However the word "hack" is often twisted by the media to mean criminal.

To learn to "hack into a website" is in fact the same as learning to upkeep a website.

Therefore my advice to you is to run a server from your own house and call it a hacking site. You'll almost instantly get kids from around the globe trying to prove themselves as the greatest by breaking your defences. Not only will you learn how to defend your system, you will also hopefully learn that to misuse a computer system is to cause a lot of pain for those who try to keep your online world available.

I am not going to tell you how to hack into a website, because it's not just immoral but can land you with (I believe, and I'm not a lawyer) a maximum of three years in jail. True hacking is about learning as much as you can, and learning that it's not worth a stretch behind bars is the first lesson.