Things to learn

water

https://www.blendernation.com/2018/06/24/create-realistic-simulated-rain-puddles-in-blender-cgc-weekly-12/

green screen

https://www.blendernation.com/2018/06/17/blender-tutorial-blender-and-a-bad-greenscreen/

Fast rig selection
https://www.blendernation.com/2018/06/16/cenda-tools/