What is Aperture?

The size of the hole the light passes through to get the picture.

What is Shutter?

A curtain that allows light to come into the camera for the picture.

What is the ISO?

It determines how sensitive the camera is to light.

How do these things help us make a better image?

Without one the other wouldn’t be able to work, So they all combine to create a good image. Along with that, they all affect each other. When you change one the other usually has to be changed in order to come out with as good image.