In fact all the rules of photography apply to both film and digital cameras. It's the medium (film or digital) that makes some difference (at least for now). When it comes to convenience, now digital cameras outstrip film in almost every ways. Even the less expensive digital can put out images that are far more shaper than the sharpest images from best films in industry. There are some areas where it will take several years for digital camera to perfect the technology to beat the film. When rendering highlight areas (the brightest spots of a scene) digital cameras do very crappy job. This is not a problem when using film. This the reason why hollywood still shoots on film. High end commercial are still shot on film. For large format photography (ie..for commercials etc) there is very limited option but to use film. Film is future proof whereas digial is not. The best thing is that I have decided to go digital.