There are two very useful online camera simulators that I'd recommend to help you get a better understanding of depth of field and other aspects of photography.
1. Start with Photonhead's "SimCam - Shutter and Aperture" page. It'll allow you to control a few features of the camera. What settings would get you those blurry background photos? Why? Also, try out the film speed or ISO simulator. Make changes in the settings and then take the photo (i.e. click on "shoot it"). Before clicking the shoot it button make a guess on what the new photo will look like. Work with the simulations until your guess match the resulting photo.
2. Also, try CameraSim.com. Once you've gotten comfortable for Photonheads camera simulator, then move on to this more complicated simulator. You can go directly to the site or try the embed below.
When you are working with both of these simulators, it is important that after you change some settings and before you press the click button, that you make a guess as to what you think the simulated photograph will look like. Only stop messing with these simulators, once you get all your guesses right.
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