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Point the camera at the thing you want a picture of. Think about what is inside the picture, and what is not. Change this by pointing the camera in slightly different directions.
When what you want in the picture is in the frame and what you don't want in it isn't, press the shutter button to take the picture.
Don't worry about settings, set it to Auto, or better yet, "P" (Program) mode. This lets the camera figure out the boring stuff for you, so you can relax and think about taking pictures.