>>326202797
Building maps is basically unity game development with a limited toolset. Everything's documented and freely available, you just need to put in the work. You'll need a specific version of Unity, the VRCSDK, and then just whatever you build. Udon lets you do a lot of stuff that was hard or impossible with VRCTriggers so if you're doing games you'll want to start with Udon features in mind.
https://docs.vrchat.com/docs/worlds