Can we PLEASE get succinct, worded and diagram versions of these so there's no need to wade through 40+ minutes of marketing driven tutorials to glean what's gleanable in each?

The following MODX Tutorial article covers the Quick Edit Knobs and gives a more in depth look at the basics of Navigation:

Link: Mastering MODX - LEARN: Navigation Tips

Please feel free to post any specific questions you have if something is not clear. Some folks like to see the buttons pressed and the Knobs turned. The articles can give you more background on what you are seeing.