Exposure triangle, a way of interacting the three elements of exposure, such as aperture, shutter speed, and ISO. Each of these elements has a huge impact on the image. But it is impossible to take a photo without the interaction of these elements.
Aperture offers considerably more depth of field. The shutter speed is an exposure time. ISO helps both elements. In automatic mode, all three elements work automatically. In the aperture and shutter mode, you set one of the elements and, if necessary, you set up ISO.
But if you can set all of three elements of the exposure triangle together you will get the skill to shoot in manual mode take control of your camera.
