The one biggest suggestion I can make as you get the new machine is to stop thinking in Windows terms and framework. The macOS is an entirely different animal. The biggest difference is that unlike Windows (at least through Win7 and early Win10) you don't really need to spend a lot of time "tuning," or "adjusting," or "optimizing" your Mac. Generally, macOS is already optimized for you, so all you need to do is set up a few preferences and then just use the machine. That's what the "it just works" slogan really meant--you don't need to take care of the Mac, it pretty much takes care of itself. So stop thinking in terms of "where and how do I put this" and more in the "what do I want to do" mode. Obviously, there will be times when you will want to open a new folder, move some files around, etc., but things like disk organization, defragging, constant updates, etc, are much different and rare in the Mac universe.