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| 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. |
| Artificial Intelligence | AI controls the behavior of all but the simplest of NPC actions. |
| 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 on the Source Engine's features. |
| Glossary | Explanations for terms you may encounter. |
| Official Tools | Official tools made by Valve for their games. |
| 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. |
