This tutorial is pretty ancient now and is based on HTML. If i get a chance soon i will we-write this to explain how XHTML works.
XHTML is pretty much the same as HTML just abit stricter, XHTML requires u finish tags with "/" instead of leaving them open.
A basic example is a IMG tag:
Code:
<img src="image.jpg" border="0" alt="" />
As u can see
ALT is now required for every image placed and its ended with
/>
Since using XHTML i have changed my bad habit of using <br /> and using proper <p> </p> tags when adding text to my sites hehe