How to measure the gray scale in photography? How to increase exposure? I just bought a D3000 camera, but I still know nothing about photography.

Gray measurement is actually practicing your accurate exposure, with a 18 degree gray card.

There are several ways to increase the exposure. The first is to reduce the shutter speed, the second is to enlarge the aperture, and the third is to add files directly in the exposure. . .

You'd better learn more basic knowledge! ! !