What is exposure in photography?
In general terms, exposure is how light or dark an image is. It’s controlled by changing one or all of three camera settings: ISO, Aperture or Shutter Speed.
On my free Manual Photography Cheat Sheet, I suggest using your camera’s light meter to help you set your exposure. By looking at your in-camera light meter and adjusting one of the camera setting mentioned above, you can change your exposure. Whether you prefer your photos lighter or darker than what your camera sets as “0” is personal preference.
Here is a shot I took last night, adjusted to show you over exposure & under exposure.