I am picking up on computer graphics again now, too, after dabbling a bit in it well over 18 years ago (and for a small iOS game 8 years ago). I am restricting myself to Apples platform currently, this might not be what you want, but maybe others prefer it. They have great SceneKit WWDC videos dating back all the way to 2012. I recommend watching them from 2012 to 2017 in historical order. Also I am learning Blender, a free 3D authoring tool. I can recommend the free wiki book at
https://en.wikibooks.org/wiki/Blender_3D:_Noob_to_Pro .
