22 things you can do today to change your photography forever. Do it. Seriously, do it. It takes just a day, and you will have learned something useful. If you really want to learn to use your camera, do this ASAP.
A very handy cheat sheet for beginners summarising the relationship between aperture, shutter speed and ISO. It also shows, in a simple manner, the impact of the adjustments made to aperture, shutter speed and ISO.