Hi nairaby!
Ok, there not incredibly in depth and don't give you all the nit picky details, but especially when you're starting out, I find that's a good thing. W3 Schools is fabulous at giving you a good introduction, and more importantly, I've never found anything actually incorrect, so it's well edited. That's usually the first place I go for tutorials on a new subject and you can start googling from there. Their tutorials on XHTML are at...
http://www.w3schools.com/xhtml/
My other recommendation is to validate your webpages. A lot of people tell you to do this just because "it's what you do". It's actually really valuable. I had a webpage where I'd nested two tags that can't go together, specifically like this.
Code:
<p>This is my paragraph. <div> and this is my little div inside it</div></p>
The validator caught it and I was able to make that correction, so it's a good debugging tool. Valid code means that you'll have better browser compatibility, though I always check it in browsers too, since no browser handles even valid code in exactly the same way. The "real" XHTML validator is at...
http://validator.w3.org/
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XHTML Validation
:)