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The most common use for ISO adjustment is when you're shooting in low light. When light dims, you need to raise ISO to ensure a faster shutter speed that's quick enough to prevent camera shake. However, there is a price to pay for raising your ISO. As ISO increases, your image will possibly get noisier. So unfortunately, you can't just set your ISO as high as it will go. Instead, you always want to use the lowest ISO that you can get away with. Noise response varies from camera to camera, so hopefully you've tested yours already and have good idea of what the maximum ISO setting is that you're comfortable with, in terms of final noise in your image.
Now it's time to do some shooting. Head into some low-light situations. I don't mean that you have to go out on dark streets, although that's fine. But even the inside of your own house can get dark enough to cause shutter-speed problems. Find some locations that drop your shutter speed too low and practice controlling your ISO to get usable results.
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