Totally not biased, but that first link is a great place to start.

Note that the process for making games is the same as for making mods - games are a collection of mod(ule)s.

I'll make a note about the docs being hard to find, obviously room to improve here. This page is intended to be the starting page for those interested in modding/game making, it gives an overview and links to other resources: https://dev.minetest.net/Modding_Intro

> Note that the process for making games is the same as for making mods - games are a collection of mod(ule)s.

I think this is what is confusing. If you call it a game engine, I expect it to make... Games. It's just weird is all.