Shutter speed is the length of time the shutter / sensor on the camera is open to see the subject to be photographed. This is related to the amount of light entering the camera. The faster the shutter speed, the faster the camera sensor will open, and the less light will enter. On the other hand, the slower the shutter speed, the longer the camera sensor is open and the greater the amount of light entering.
Source : https://www.diykamera.com/pengertian-shutter-speed/
You can determine what expression you want to show in the photo by using the shutter speed. With a fast shutter speed you can freeze objects and give a dynamic impression, while with a slow shutter speed you can give a motion blur effect (peaceful impression in the image below).
Source :https://snapshot.canon-asia.com/indonesia/article/id/lesson-4-understanding-shutter-speed
The safe shutter speed limit is greater than the length of our lens. If we use a 50mm lens, then use a minimum shutter speed of 1/60 second.
For slow shutter speeds, you can use bulb and tripod mode to help prevent the images you take from being blurry. Apart from that, a slow shutter speed can also show the effect of movement. The way to do this is by slowing down the shutter speed when the object is moving, as in the image below.
A shutter speed of 5 minutes (300 seconds) is needed to soften the effect of cloud movement and water surface waves as in this photo. 300 seconds, F/9 ISO 100.
(Photo by Cedric Klei)
Good luck, KEE friends!