Course Recommendations?

hello, 

have you tryed or done these already ? 

https://cgcookie.com/course/fundamentals-of-blender-materials-and-shading

https://cgcookie.com/course/modeling-texturing-shading-a-treasure-chest-in-blender-2-8

ist not a 2.9 tutorial but that should not be a problem here.
even if you run in a problem let us know and we will do our best to help you out :)
another great course if youre pretty new is the rocket modeling course (you also get to work with texture, materials but even with particles , going in node editor ...)

https://cgcookie.com/course/build-and-animate-a-low-poly-rocket-in-blender-for-beginners

Thank you!! These are very helpful! 

Yukino's suggestions are good.  If I may add...

The Fundamentals of Blender Materials and Shading is probably where you want to start.

https://cgcookie.com/course/fundamentals-of-blender-materials-and-shading

I took this course a few months ago and took a lot of notes.  I have already referred back to them several times, which for me is quicker than re-viewing the entire video.  I then followed up by taking portions of the Shader Forge course that interested me.

https://cgcookie.com/course/shader-forge

You may be turned off of the Shader Forge course because it is "old."  I can tell you that the workflow still pertains to 2.9.  The main problem that I encountered pretty quickly was the Voronoi Texture, which has changed in recent versions of Blender.  But, I found a solution very quickly by reading the questions posted by other students.  I have learned in working on CG Cookie that if I encounter a problem, often is the case that others have also and a solution can easily be found.  I usually read the questions before viewing the course, so that I can see what obstacles I might encounter.

Good luck with your journey.

Cheers

Splat