Typography is the art of arranging type; be it type size, letter spacing or line length. By implementing a few easy tricks, your web page will go from dull and boring, to rich and entertaining.
When setting up your type, be sure to make the default font size is easy to read. If it is too small, your readers might blow past your site in favor for one where they can read the content. On the other side, if it is too large, your readers will assume your yelling; much like using all capitals. I found some more information here.
Keep in mind the contrast when choosing the background and font color. Light text over a dark background may look cool and fit the theme of your site, but try to keep this to a minimal, as it is hard on the eyes. Try reversing the scheme to keep your colors.
Another thing to consider is space between bodies of text. Readers will pass over large, unbroken blocks. Break up your text into smaller sections.
If you keep these easy tips in mind when designing your web page, the site will be greatly enhanced and visitors will be more likely to use your site more often.