Thanks for the feedback on the suggestions, Deecey. Here's a start:

Material Room - a general direction on uses for the different nodes. It's one thing to experiment in a given ballpark, but knowing what kinds of nodes are going to be anywhere close to what you need is another matter. If I know that a certain math function tends to do X, I'll know whether or not it's significant to the particular sort of shader I want to work on.

Hair Room - basically, there is almost no useful info on the hair room, so almost anything would be helpful. But in particular, clearly-laid-out instructions on the Styling Tool would be a good start, along with explanation and examples of what the various settings in the Dynamics controls actually do.

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Hardware: AMD Ryzen 9 3900X/MSI MAG570 Tomahawk X570/Zotac Geforce GTX 1650 Super 4GB/32GB OLOy RAM

Software: Windows 10 Professional/Poser Pro 11/Photoshop/Postworkshop 3