HTML/CSS help? I'm going crazy!

[Time Bandit]

The W3C Schools site is excellent for the self taught. Don't let the 'schools ' bit put you off - its really comprehensive (XHTML, CSS, JavaScript, XML etc.)

http://www.w3schools.com/

Also nothing wrong with notepad - although you might find that a proper editor will make it easier to organise your code - different colours for commands, set indents etc. There are loads of free ones out there:

emacs (http://www.gnu.org/software/emacs/)
jedit (http://www.jedit.org/)
and many more.

The W3C validator mentioned by Flash477 is also a must if you want your pages to display well on different browsers.

[scaryjim]

... you might find that a proper editor will make it easier to organise your code ...

I'd add Notepad++ to that list as a great Windows text editor with syntax highlighting and outlining (i.e. it'll colour your tags different colours to your body text and let you expand and collapse tags that you're not working on so they don't distract you). It's the one I use at work for making quick edits to HTML files (although I use Visual Studio for the bulk of my work).