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As other have said, stop using Auto and start using A or PIn AUTO ISO Tryincrease the shutter speed by 2 clicks and do NOT set any maximum ISO In A, if you are not too sure what aperture to set, try F8 if there is a reasonable amount of light aboutIn poor light set it wide open Do not "try" anything on anything important just take lot of photographs close to home and examine them on your computer the same day
Thanks to everyone for all the useful advice. I think I was too hard on my camera, and plan to put some time into learning how to use it properly.