While I agree, there is no shortcut to simply picking up a camera and getting a few thousand shutter actuations to learn whats what (and most definitely not on

While I agree, there is no shortcut to simply picking up a camera and getting a few thousand shutter actuations to learn whats what (and most definitely not on green box mode if learning is the intention), some demonstrations like pulling two instances of this up and putting distance/focal length at opposite extremes in each to show the compression of the compression of the backdrop work very well.