This is the exposure triangle
Shutter Speed-
Shutter speed is the time for which the shutter will remain open. It determines whether the picture will be frozen action or blurring motion. if you want to capture something moving really fast without letting the motion blur spoil your photo, raise the shutter speed.
Aperture-
The aperture controls the area over which light can enter your camera. Therefore if the aperture is higher more light is able to enter through the lens.
The aperture controls the area over which light can enter your camera. Therefore if the aperture is higher more light is able to enter through the lens.
ISO-
ISO is the level of sensitivity of your camera to available light. The lower the ISO number, the less sensitive it is to the light, while a higher ISO number increases the sensitivity of your camera.