Graffiti types and styles

A website started in 1998, fatcap.com, has a page with a few Tucson artists, though it's hardly worth a look for that. What's interesting is the long list of links at the right edge of the page (which may not be easy to view on phones). It lists types and styles of graffiti. There's also a section showing street art on various "supports": on tunnels, trains, rooftops…