From newbie to pro, this site has just about everything you need to use HTML effectively, and then some.

No book on HTML is complete without a section on the ways to overcome the pronounced Western bias in the language and to provide for its fruitful application in the worldwide multilingual environment. This chapter covers the main approaches to this problem, both those used by practicing webmasters all around the world and those devised by standard-setting bodies.

Concise HTML tutorial covering tags, tables, frames, forms, active channels, ecommerce, multimedia, search engines and more.

Good introductory guide to the internationalization of HTML from Webmonkey.