I think the elements and principles of design are the things the beginning art photographer needs to study. I had been studying and practicing photography for close to a decade until I got to university, and began studying photography as a fine art, in the fine arts department. I also studied photography from the university science department, and in a practical sense, learned about photojournalistic photography. The things I learned from the fine arts people were so,so,so different from what I had learned from years' worth of books and magazines about the craft side of photography.
It's a shame that so many people look at photography as little more than a paint-by-numbers type of thing, a reduction of photography to purely numerical qualities like black point, white point, white balance in degrees Kelvin, focal lengths,etc.. The idea that solid technical numbers (good exposure, good tonal range,decent focus) can overcome atrocious, unstudied composition.
An example of what gets my goat: a horizontal composition with 40% of the frame allocated to a person placed in the center of the frame, and 60% of the frame empty, filled with dead space on either side of the head, and of course, the top of the head lopped off; even more tragic is the person placed at a "Rule of Thirds" intersection, and then the eyes looking to the short side of the frame, with 70% of the frame filled with dead space; and then hearing the comment, "I like to explore negative space in my work." These two scenarios are prime examples of people who have not been exposed to the ideas of the elements and principles of design.
Bitter Jeweler's commentary in Post #21 says it all, almost PERFECTLY.