After two thousands of hours of experience in 3D speedran in just 11 months I decided I am qualified to share a part of my knowledge with the community, since it is thanks to other creators that I am where I am now. I want to help the beginners, so I put together 4 episodes of explaining shaders, also called materials in Blender. It is completely free and you can watch it on my youtube channel:

Full course playlist: https://www.youtube.com/playlist?list=PLGFcXZZ-rEBoszw_antw2hhjepUaAXMHV