Tutorials for xhtml

I heared that xtml helps the site loads faster so I decided to learn xthml and redesign my site with it.

Can you help me with some resources to start over?

Thanks in advance for your replies :)

Here are some good tutorials to start over with xhtml :

http://www.w3schools.com/xhtml/default.asp

http://www.freewebmasterhelp.com/tutorials/xhtml

http://www.websitetips.com/xhtml/

I'll have to take a look at these, thanks for some more links.