While font use is up to the indiviudal, the typical use on the web follows.
Sans-serif is the most commonly used font style because it displays the clearest. It is the easiest to read on the web. It is almost always used for the main text.
Serif fonts are usually used for headlines. Serifs are the extra little bitsat the stroke ends. The little serifs tend to be difficult to see in smaller sizes making it more difficult to read in the main text. BUT, in print, serifs are preferred. Almost any Bible, novel or newspaper you pick up will be printed in a serif font.
Monotype is almost always used for code examples. It resembles typewriter type in that each character takes the same amount of space as every other character. It is a good choice for headlines also. You can use it in small blocks of copy.
.fant {font-family: Chiller, "Curlz MT", fantasy;}
Fantasy is used sparingly as it is unlikely the viewer will have the same fonts as you.
If you must have a specific font that is not among basic fonts, make a gif and upload the image. But please consider readability.
