Hacking a computer or a website are similar in terms of the security. The fundamental skill required for this purpose is programming, be it in any language. Learning a programming language is essential to learn the hacking procedures. It is easier to learn hacking if you have open source softwares like Unix. Along with the programming skills, some knowledge about the World Wide Web and HTML (Hyper Text Markup Language - the language of the web) is necessary. Good knowledge of English language is also a plus point. But only a lot of practice on programming and HTML will make one a successful hacker.