I set my aperture to 2.8, which created a narrow depth of field and the toy airplane was only in focus.
With a faster shutter speed, I am able to capture a still picture of the fan on the airplane that was moving very quick, if I had it lower it would appear invisible.
Having the ISO speed way to high made a grain-like filter over the photo.
On Shutter Priority , as you move the Shutter Speed down to a smaller number, the aperture goes to a higher number, and the ISO Speed moves to a lower number with the shutter speed.
On Aperture Priority, the ISO stays at a still number and the shutter speed moves down as the aperture number goes up.