where to be, and when
whether to view a wide or narrow angle, with or without filters that adjust the color balance or image.
whether to use black and white or color film, slide, print or digital film, and the sensitivity of the film to low light.
the effects of the lens opening (f-stop) and exposure time (shutter speed) on the sharpness and clarity of the image.
where to aim, what to focus on, and when to click the shutter.