I think I read another post where a user said that you can go back to defaults by selecting another material or quality, and then going back. So write down all your settings first (
), then make a couple of those major changes (material, quality), then go back and see if the settings got set to defaults for that profile.
As for what each of the settings actually does, I think we're all waiting with great anticipation for a "reference manual" or other documentation. Right now, you pretty much have to go with:
* the descriptions that are there on the screen
* the tooltips that come up when you hover the mouse over one of the settings
* the quick-start guide
* what people have typed here in the forum
My machine has had so many dinks from the defaults I can't keep track any more, and I have NOT been writing things down -- just saving my Process each time. IIRC, here's a function to export your process, so you can get it back.
I'm one of those who can't/won't /don't do, so we TEACH!
Hoping you develop better habits than I have, I remain: