Half-Life SDK
Todo: Add links to applicable 
TWHL Wiki pages on various GoldSrc pages, such as entity pages, as that wiki is more up-to-date and verbose for GoldSrc content.
…
The 
Half-Life SDK is the set of tools needed to create content for GoldSrc. On 30th August 2013, the Half-Life SDK was finally added to Steam in the 'Tools' section. You can now create and compile Half-Life and other GoldSrc mods for Windows, macOS and Linux as a result of the SteamPipe updates.
| Modding | Creating, organizing and releasing your GoldSrc 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. |
| Modeling | Models are the detailed 3D objects that appear in the game world. |
| Textures | Textures are used to add additional 2-dimensional detail to a map or model. |
| Sounds | Quality audio adds a fourth dimension to your world. |
| Sprites | Effects like smoke, sparks, blood and fire are created with sprites. |
| Tutorials | Step-by-step guides on a variety of topics. |
| Technical | In-depth discussion on the GoldSrc 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. |
| |||||||||||
