Please review and critique "Zero to Superhero"

[rinkjustice]

If you fellow webmasters could review my website (it's to support and promote my ebook entitled Zero to Superhero), I would much appreciate it. My website is here:

http://www.zerotosuperhero.com

Many thanks.

[ray326]

I like the concept. Looks like you might have the wrong doctype, though.

http://validator.w3.org/check?verbose=1&uri=http://www.zerotosuperhero.com/lose_fat.htm

[rinkjustice]

How do I change my doctype so it suits my page? Are there any tutorials/explanations you could point to/render? I need to do some learning.

[ray326]

Your page code is HTML, not XHTML. Start with an HTML 4.01 strict doctype and either fix the page or the doctype from there.

http://www.alistapart.com/articles/doctype/