I feel it is very helpful at one stage of consciousness to bring up to awareness all the things you did do right or wrong by
intuition earlier on the path of the photographer.
One usually begins with an awareness of the main subject and is happpy if that is pictured more or less the way
you wanted it to be pictured.
Also one camera with one lens is usually the starting point.
So one learns about and tries the effect of aperture and time on Depth Of Field and Motion Blur.
That Makes Three: Getting the exposure right and at a certain exposure decide which combination of time and
aperture are just right. Both still centered on the main subject. Like in: choose f=11 or f=16 for Architecture and f=2 to f=4
for Portraits.
Then, that brings us a big step forward: the young photographer discovers the background as a very important
element of consideration. But that is the STARTING POINT.
Because. The BACKGROUND is not only form and area and color dissolving or being definitely rendered adding
to or distracting from the main subject.
The background comments on or plays a supporting role in the story you tell in the picture.
The background rendering changes with focal length and rendering style of lenses which increases the interest in
more and more different lenses....
That is where this discussion kicks in ...