If you are a newbie like me and these settings have you confused, WATCH THIS VIDEO! This guy explains everything and also shows the differences. Very well done video. I want to watch it again and again to absorb it all.
Aperture, Shutter Speed, ISO, & Light Explained-Understanding Exposure & Camera Settings - YouTube
Aperture, Shutter Speed, ISO, & Light Explained-Understanding Exposure & Camera Settings - YouTube