With Aperture (from last week) you figure out how to keep subjects in focus or out of focus. But with Shutter Speed you learn how to make blur or not. It regulates how fast the picture is taken. And if left open for long periods you can get really awesome photos. But with this you also need to control how much light is coming in. I don't have much else to say about it but to just go out and play with it a lot =D
Take ten long exposures. Take fifteen fast exposures.
Last Weeks Homework (Aperture):