Photography really is THIS simple: The light bouncing off of whatever you’re looking at enters through the aperture of the lens and waits for the shutter to snap open where it’s exposed to the camera sensor.

That’s it.

Aperture ---> Shutter -----> Image Sensor (ISO).

Your job is to find the right settings combination of these three basic parts of the camera so that the amount of light landing on the sensor makes for a pleasing exposure.

So what's a good exposure?