A good friend of mine showed me the cute webpage of the “SLR Camera Simulator”. This simulator gives you the chance to interactively play around with a virtual camera that features the major controls any serious photographer should master: focal length, aperture, shutter speed, and ISO sensitivity.
If you are new to photography, this is a great way to get a feel for how a camera responds to your input. Of course you could (and should) also use a real camera to play around, but at least this little girl is more patient than any real-life human child. And the site gives handy feedback, too.
Click image (below) to redirect to The SLR Camera Simulator: