Any chance there is a legend or map of what the areas on the front end are called?

i.e.   'reset area background', 'widget title bar', 'moderated background', 'dark area background', 'light area background', etc etc .... a diagram would be handy.  Little pop up explanations would have been better.

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There is none

the only solution is use your localhost to enable advanced theme editing, to see the setting keys

TAMAN, is that Developer's Mode?

So far, the only I've known how to do anything beyond the basic theme Edit is to right-click where I want to change, use Inspect Element to get the CSS class for that segment and look it up in the theme CSS.  Still quite trial and error.

49 minutes ago, liquidfractal said:

TAMAN, is that Developer's Mode?

No. designer mode, for theme editing, you will be able to see the theme setting keys. is that what you looking for?