Found a post on another site I thought was really good, not sure where to post it at .
Here are two inter-active sites that allow you to make changes and see immediate results:
- f /stop (Lens Opening) and ISO
- f/stop and Shutter Speed - and immediately see the results.
Interactive Site 1
This first site shows what happens when you change the 3 most important settings. You can then make any adjustments in order to get a "better" picture. This one uses a dog as its subject.http://dryreading.com/camera/index.html
Interactive site 2
This site shows a picture (of a young couple) and allows you to change the f stop (lens opening) and shutter speed to instantly see what happens when you increase or decrease the settings:http://www.photonhead.com/exposure/simcam.php
Either one (or both) should be able help you to improve your skills.