Listed below are documents and sites that have helpful information about coding in Lua. If you ever become confused about something in Lua, check out one of these sources for help.
Official Lua References
Garry's Mod Lua GitHub
This is the base Lua code that is included in the official release of Garry's Mod. It's identical to the lua code found in the garrysmod folder on a fresh installation.
Unofficial Lua References
These sources could possibly be: Inaccurate, Outdated, or Obsolete.
The following references were not published by the Lua Development Team, but by other sources.
- Gmod 12 Wiki Lua Articles. Some of the information here is outdated now because of Gmod 13.
- Ideone.com. A script checker that supports Lua. However, it will not recognize Gmod-Specific commands & Variables.