Aperture is one of the two (the second being shutter speed) of the most important aspects in photography. If used the wrong way it can ruin your pictures-but hopefully when you finished reading this you will be able to improve your pictures with a new-found knowledge of aperture.
Aperture is found in the lens- not the camera body. In the lens there is something like a door, and the f/numbers control how much the door is open, and how much light is let in.( You can control your aperture by using the AV-Aperture Value- setting
fffclear in all areas.