Now it's time to take [...] and understand Godot with 3d.  

Link to blender 2 godot exporter:

• https://gamefromscratch.com/blender2godot-add-on-released/
• Points to https://www.zammedev.com/home/wip_projects/blender2godot
• Points to https://gitlab.com/Zamme/blender2godot

This seems like a good way to get started. Create something in Blender and convert it to Godot.

One obvious teaching from some games is that a 3D game can basically be just a 2d game with a 3d rendering. That is probably the easiest way to get started.