SDK Docs

Download and Installation | Frequently Asked Questions | Release Notes

Modding	Creating, organizing and releasing your Source project
Level Design	Maps are the 3D worlds where everything comes together
Programming	A mod's C++ code defines the way its world and game rules behave
Scripting	Scripting can be used for adding new functionality or logic to entities
Modeling	Models are the detailed 3D objects that appear in the game world
Materials	Textures and shaders are combined in Source to create materials
Sounds	Quality audio adds a fourth dimension to your world
Particles	Effects like smoke, sparks, blood and fire are created with particles
Choreography	Direct your digital actors' performances with choreographed scenes
Filmmaker	Create movies inside the Source Engine
Tutorials	Step-by-step guides on a variety of topics
Technical	In-depth discussion of Source's features
Glossary	Explanations for terms you may encounter
Third-Party Tools	Useful developer tools created by the community
I/O System	The I/O system is the backbone of most levels in Source based games/mods