If you are new to photography and having problems getting your head around the different exposure modes your camera offers, and how changing shutter speed and aperture affect the final outcome, you may like to take a look at the cameraDemo web site by Craig Hickman. This site offers an interactive tool that lets you fiddle with all the relevant settings and see how they affect the final image. It’s very nicely done and shows settings, exposure and depth of field rather nicely.

The only problem I’ve found is that the “Auto” exposure mode shows the wrong depth of field when you select it but, if you are interested in the kinds of thing this tool is trying to teach you, you would never be using “Auto” anyway, would you?