The big thing is learning to see like the camera. We all have an image in our head when we release the shutter. If we know how the camera sees it, and how to adjust for that, we will come away much happier.
When I first started, I was always disappointed because my images looked nothing like what I saw. The best advice I ever got was, "It does not matter what you see, it matters what your camera sees. Learn to see how your camera sees."
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