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Plan what you want to shoot and how to go about it. Consider composition, the effect of light and the settings to use. Also establish if a tripod is required for a steady shot. Select a shooting mode appropriate for the situation. If unsure about this, your camera manual will be helpful. Pre-programmed modes are useful if you are not yet familiar with your camera, but using them means relinquishing control over a particular situation which can inhibit creativity. When you are more comfortable with the multitude of settings, your intuition will play a major role in achieving the results you wish to attain. I often take several shots of the same subject from different angles, distances and directions, rarely deleting images on the spot and always reviewing shots in-camera, adjusting and taking more if required. After all, digital film is cheap.