Tutorials are still kinda WIP:
https://docs.larian.game/The_Divinity_Engine_2

There's the "build a basic quest" video tutorial series as well that Windmere is doing good work on so I don't have to :P
https://docs.larian.game/Tutorial_-_Implementing_a_Basic_Quest


A lot of the finer tips you can gather by watching him move around the editor a bit.

My D:OS Mods:
Dunamis - A 15 hour Adventure Mod for D:OS EE

A Necromancer's Crusade - 10 hour adventure mod for D:OS EE

4 Character Creation (EE)