Explanation:
Aperture changes the amount of light that reaches your camera sensor (and therefore your image brightness.
In a dark room, you want to have a large aperture to capture the most light, and on a bright sunny day, you want to have a low aperture to capture less light.
The shutter speed is the length of time that your camera shutter is open, or how long your camera spends taking a photo. The longer your camera shutter is open, the more light gets exposed onto the camera sensor.
Having a slow shutter speed can you help you blur moving objects, like vehicles, flowing water, or other moving subjects. You might also use a slow shutter speed for night sky photography (example attached below).
On the other hand, having a quick shutter speed captures objects as they are at that moment in time, like trying to capture nearly instantaneous photos of fast-moving things such as athletes or a bird in flight (example attached below). A quick shutter speed is also useful in bright light.
