World
World objects are what can be rendered in the 3D environment when placed inside of the Environment service.
You can create these inside of the creator when building or use the Instance global to create one using:
local myNewPart = Instance.new("Part")
You must make sure you type the name of an actual instance that exists in the game, you cannot create an object that doesn't exist!
Polytoria IntelliSense can also help you auto-fill the parameters by suggesting you the classes that can be put inside the parameters.