Tutorials / intro / 2d game step by step:
https://www.gamefromscratch.com/page/Godot-3-Tutorial-Series-Index.aspx

https://godotengine.org/download/windows

The download is not an installer, it’s the full thing just zipped in-place.

Which means if I won’t use C#, just use the standard thing and I can always trivially change later.

“Godot… standard vs Mono C#” -- the difference is that the 2nd supports everything(?) including C#, whereas the former is limited to using GDScript (a python look-alike). I’d venture the C# one is designed to ease people coming from Unity.

The C# version requires the Mono SDK: https://www.mono-project.com/download/stable/

Or the Visual Studio Build Tools: https://visualstudio.microsoft.com/downloads/?q=build+tools (which seem packaged separately from the full VS.Net?)

Thus going with Standard for now.

Doing what?

Either 2d or 3d (fixed perspective, toy like rendering), something with trains and tracks. First do a prototype demo to see if I can even render what I like. Game wise I'd like a tower defense/attack.