Node Crash Course?

I’m fairly familiar with the principles of modelling etc., but using a node-based interface is completely new to me. What’s my best bet in learning how to use nodes besides the standard diffuse/gloss combo? I’ve been downloading some shaders but it’s not really the best practice when sometimes I don’t even know why a node is set up a certain way. Ideally I’d like something to read/watch for free, but I’m willing to pay money for a good online course as well.

There’s tons of tutorials on this - and for free on YouTube. I recommend the PBR shader - all-in-one solution. Example tutorial: intro to PBR

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