You don't know what aperture is? Here, let me explain it to you.
Aperture is the amount of light that you let into a shot. This is very important for taking a picture because light is the key factor of photography. An example of aperture would be the human eye, (Yes, the human eye). To understand the example of the human eye, you can get a friend to look at you eyes when the lights are on. Then turn the lights off and see how the pupil of your friends eye changes. The pupil got larger in the dark, did it not? It gets bigger because your eye is adjusting to the light. This is the same way aperture works, you have to adjust the aperture (f-stop) to the amount of light you would like in the picture. When you have a high f-stop, you are letting less light in, so your picture will be clear throughout. If you have a low f-stop, you are letting in more light, which makes your photo have a focus. And this focus can be on the background or can be on the subject.
This is an example on the different types of f-stops and how much light is each lets in.
Now when changing the f-stops, you must make sure that your shutter speed corresponds with the f-stops. The shutter speed must be at zero, on your light meter. When you get your s-stop, and shutter speed correct, you can then take your photo.
This is a picture with a low f-stop,
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