The SLR Camera Simulator is probably the best online camera simulator of them all. It is an essential bookmark if you are a photography rookie. You can start of from the The SLR camera explained section which is a cool interactive display of how a DSLR works. It is a step-by-step walkthrough of what aperture, shutter speeds, and ISO settings are all about. It takes just about 2 minutes to learn.
The DSLR Camera Simulator is a virtual camera where you can twiddle around with the different settings and combos. Click the blue “i” (the help mode) to learn about the camera controls. In photography, everything starts with the light. So, keeping that at different points, you can tweak the other controls to click the “perfect” photo of the little girl. You can also check the tripod option to see how it enhances photos (and whether you should invest in one).