Gmod Lua - Making Addons

Hey, I have been trying to learn lua for a while now. It’s just that I can’t figure out where to start. I have read a good amount on wikis but I have no idea what to implement into the software, where to implement stuff, how to code the things that I need, etc.

If anyone could help me or point me in the right direction, or teach me themselves that would be amazing! My steam is Vrael if you want to add me.