rendering: different materials

Judging by the sketches, seems like there are lots of marker-adept people on here…

Can someone show a brief tutorial on different rendering techniques for wood, glass, and metal? I don’t need anything complex, just something that enables one to render the “essence” of these three materials…

I realize there are books out there, but the few that I’ve come across at the library and bookstore are not quite comprehensive enough… In fact they didn’t teach me anything.

Try a Dick Powell book. He always has a thing about wood, chrome, glass, plastic… gloss/matte