Essential working parts of a modern camera

The essential working parts of a modern working camera body would be, the main switch which turns the camera on, the shutter release button which you press when you take the photo, the shutter dial which changes the shutter speed, the exposure compensation dial which changes the amount of light entering the camera, the back cover release button which opens the back of the camera to put in film or take it out, the mid-roll rewind button rolls the film back into the case so you can take it out before using your whole roll of film, and the lens information contacts help you set the lens to the camera.