There is no excerpt given but the central idea here is that there is a great injustice being done to African Americans
Here, the word dote probably means 4. cherish. It is an old word which means deep and uncritical adoration for something.
3. Changing the Aperture changes the amount of light that is able to come through the lens.
4. Slowing your shutter speed creates a blurred effect.
5. Using a quick shutter speed creates a crystal clear photo. The image is still, with no signs of blur.
My dad is a photographer so I know some of this stuff