Learning plain HTML isn't going to get you far, especially if you're just learning html and not xhtml.

Ideally, you should learn:
xHTML and CSS (the front end, what everyone sees)
PHP and MySQL (the back end, which drives interactive applications)

Then I'd say to get involved in Javascript and AJAX.
_________________________
Donate to UGN Security here.
UGN Security, Back of the Web, Elite Web Gamers & VNC Web Design Owner