Index of lessons These tutorials are oriented toward the virgin mapper who hasn't even touched an editor. If you're allready proficient with Radiant then go to the advanced section. Here are the files you'll need for mapping.
 
Introduction:
A basic tutorial on what a map is and
how Radiant works.
 
Compiling:
The full monty on compiling your map
and adding bot support. 
 
Your first room:
Shows you the basics of making a room
and texturing it.
 
Making the .pk3 file:
A tutorial showing how to make the 
.pk3 file.
 
Introducing entities:
Shows how to import entities into a map
with some tips on lighting.
 
In-game support
Learn how to provide in-game support
and use custom level shots.
 
Models and Shaders:
Build a torch, import a model, create a
banner, and edit textures.
 
Teleporters:
Build a basic teleporter. Beam me up
Scotty!
 
Connecting rooms:
Add an additional room to an existing
room.  CSG subtract tutorial.
 
Building Stairs:
Building a basic stairwell and use of 
the cloning feature. 
 
Jump Pads:
A tutorial  on building a basic jump pad
and launching to a platform.
 
Fog:
Shows how to use accent and full
volumetric fog. 
 
Liquids:
Using liquids.  Create water or life 
sucking lava.
 
Basic shapes:
Build pyramids, cylinders, spheres,
and even a horn.   
Editing Shortcuts:
Lining up textures, entities, and
brush creation.