2015
The Comprehensive
Guide To SceneKit:
3D iOS Development
In 2015 after looking to learn SceneKit and finding no resources other than the documentation from Apple. I created one of the first courses ever on SceneKit. It details working with the scene hierarchy, materials, using physics, animations and even how to create a simple game.
Currently the course is hosted on Udemy: https://www.udemy.com/course/scene-kit/