I've been developing and designing websites since 2001.
I recommend you become familiar with:
XHTML, CSS, PHP, MySQL, Javascript --- these are the most popular scripting languages/tools for the majority of websites today.
You will also want to learn Photoshop, Illustrator - some form of graphic design.
I took Coldfusion, perl/cgi and the likes but have never had to use them.
Good luck!
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