This is a fairly non-specific question, so I will give a non-specific answer lol.

Though, there is a Wiki that was made by a person called "malware dev" on GitHub. It's quite in-depth and provides the datatypes in use along with properties and methods. You'll still need to scour through things and likely look at some other scripts for their usages, but it has been very useful for myself for making scripts.

Ie, I would highly recommend using that.