One cool thing to do is to set your camera on Shutter Speed Priority (Tv) and see what changing your shutter speed does for your pictures. I think the best place to see this is with water. I played with my shutter speed some this weekend so you could see the difference here. I will show the picture and give you the information on the shutter speed on top.
What you should notice in these first 2 pictures is that when my shutter speed is slower, the water looks more solid. That is because the shutter is open longer so the detail of the water runs together. The "f" is the size of your aperture. It changes with your shutter speed on Tv to help get the right amount of light in.