First an aside: I figured out what the heck was happening on the "Online View" when you first open the program. When you click on a box, say, "SiteStyles" or "Food/Faces/Buildings" or "Web fonts", the page you go to has stuff available to download and incorporate into NOF. When you click on a font or an image or a sitestyle, you get a green checkmark thingy to let you know it's downloaded.
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So maybe I'm getting old, but I had no clue what was going on.

I had stuff with a green check mark that I had "activated", and I wondered how to uncheck it to "de-activate" it.
Anyhoo... on to web fonts. So presumably when I'm editing a page, highlight some text and go to the Font drop-down list in the Text Properties Panel, I am seeing available web fonts.
So how do I know if I am selecting a web font?
What if I don't want to use web fonts, and just want to use browser fonts to keep my site streamlined?
How do I add more web fonts to NOF from Google?
Can I add web fonts from Fonts.com?