I'm just working through some exercises on how to use Godot, which is no mean feat, as they say. I like the custom scripting language, and the screen rendering: currently I'm up to moving a sprite around a small 'pallette' or window.
The book is one by Chris Bradfield, Godot Engine Game Development.
As soon as possible after completion of my modest project, which I'll show you here (are there any conventional forums about Godot?), I'm going to donate. It's non commercial, at present, for me, so will fifteen Euros/Pounds/Dollars do?