This tutorial series goes through the basic steps needed to create a cliff based level for Half-Life.

This tutorial covers some of the basic tools TG provides for texturing your terrain.

This tutorial covers what to do with your Terrain Generator created terrain in Hammer.

This tutorial details the Terrain Generator Map File format.

This tutorial covers the one method of creating caves with Terrain Generator. This is a good tutorial for beginners as it covers most of Terrain Generator's features.