the elements of art and principles of design are

guidelines for taking pleasing photographs

automatically included in every picture taken

principles that apply to photography, but not other arts

complicated concepts used only by professional photographers

Guidelines for taking pleasing photographs

Explanation:

The elements of art and principles of design are guidelines for taking pleasing photographs.

The basic concepts of any course is denoted by the principles. Therefore the principle of art and design would recommend and refer to the very basics which can be understood by any new comer.

Later, the more complicated courses are for professional photographers and etc.

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Thanks for asking.