I am thinking of doing a(nother) website, and have been wondering about whether to use HTML or XHTML. Is there really any difference between the two? Is one better than the other? I already know HTML, and have no knowledge of XHTML, and it would be great if I didn't have to learn something new to do the webpage. Is is possible to convert HTML to XHTML after it is written, or should I start with XHTML from scratch?