HTML or Hyper text Markup Language is the basis for all web pages on the Internet. With HTML and the world wide web, you have the ability to bring together text, pictures, sounds, links and other features. HTML files are plain text files, so they can be composed and edited on any type of computer with Windows, Mac, UNIX, or other operation system.
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W3
This site has two sections - Basic HTML and Advanced HTML. This is good place to learn HTML. No adversitment in resours pages.

MCLI
This is very good discriptive site on HTML. Most of the lessons can be done off-line if you download to your computer an archive of the tutorial pages.

Htmlgoodies
This site has information on HTML under different catogaries. Good site.

Htmlprimer
Try this site, another good place to learn HTML