shutter speed

Fast shutter speed

Slow shutter speed

Shutter speed captures different movement, whether it's a fast shutter speed, which captures and freezes what is happening when you pressed the button or whether it is slow shutter speed which captures the the movement of the moving thing.
For fast shutter speed I used 1/60th of a second and freeze the falling water (top photo). The problem with fast shutter speed (and it is seen in the top photo) was that since the lens isn't open for that long was that not a lot of light comes in so the images come out quite dark. To solve those problems I would use Photoshop to brighten the images.
For slow shutter speed I used 10-30 seconds to capture the movement of a light in a dark room and the shape it creates (bottom photo). The problem with slow shutter speed is judging the time needed to capture the movement and that you can't see what is happening while the photo is being taken so it's hard to see if the whole image is being captured.