Which web design languages to learn?

Hi friends! To become a professional web design programmer, which languages do you suggest to learn? I would like to know about the order like 1. html 2. css 3. php etc. And also please let me know the good resources we can learn these languages from. I think some of the languages are tough and it would take ages to learn them. Just post here how tough a language is and how much time it would take you to learn the language to comfortable with it. If you think some of the languages are very useful as well as easy, please let me know what they are. It would give some confidence to so many people (like me) who want to learn them but postpone it, thinking they are very tough. Thanks in advance.