A few tips.
A higher aperture number equates to a larger depth of field, in other words more of your fore- and background will be in focus. A smaller aperture number means that your focus point becomes smaller, fore- and background start to blur. With a larger aperture number, the shutter has a smaller opening, allowing less light to reach the sensor, so your exposure times will increase.
Higher aperture numbers are usually best used for scenic landscapes, lower aperture numbers are better for object photos where you want viewer focus to concentrate on the subject.
Shutter speed will depend on your aperture and also your subject. If you have a fast moving subject like in sports, you will typically want the fastest shutter speed you can get, with a few exceptions like when you want motion blur.
ISO settings should be kept as low as possible.
This was shot at f22, 1/100 sec, ISO 100.
Vs this shot at f5.6, 1/120 sec, ISO 100.
Motion blur panning the camera, f11, 1/90 sec, ISO 100.