The 2 settings you are on about are Aperture Size (F2.8 to F8 or so), and Shutter speed (measured in seconds (needing a tripod), tens, hundreds & thousands of seconds).
I'm sure a better photographer than me will correct me if wrong, but this is how I understand it (in my laymans terms)....
The aperture is used to set depth of field. This is basically how much of the photo will be in focus. An aperture setting of F2.8 will have the foreground in focus, and the background blurred.
The shutter speed is how long the shutter of the camera stays open. A low shutter speed can be used to achieve motion in some shots (if you pan with the moving object). A high shutter speed can capture the action better, but sometimes the photo's can lack any sign of movement, and make the cars appear stationary.
Does this help?
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