These are various sites I have found that I found/find particularly helpful when designing my site and learning HTML and CSS. They're mostly for future reference for me, but you're welcome to look at them.
- CSS Positioning
- Sticky Footer
- The em Unit & Good Practices
- CSS Selectors
- CSS Floats
- CSS Pseudo Classes (i.e.,, :first-child)
- CSS Pseudo Elements (i.e., ::first-letter)
- CSS Pseudo Element Selectors (first-letter, etc.)
- 906 Grid System (I don't use this, but it could be interesting)
- Special first paragraph (including first letter)
- Text Shadows and Outlining