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Get to know your camera well. Know where all the controls are and what all the buttons and knobs and wheels do. Don't be afraid to try the other basic shooting modes the camera offers just to see what each does. And don't be afraid to experiment with the creative shooting modes (the options with the letters instead of the pictures)...you'll eventually use these more than the other modes. They give you more control over your camera and the creative process.

Learn as much as you can about exposure. It's one of the fundamentals you must understand if you want to make the most of your DSLR.

Exposure Triangle

The Exposure Triangle – In Beginner Speak “The End of Auto Mode"

Understand Digital Photography exposure – The Exposure Triangle

Understanding Exposure with the Exposure Triangle

Making Better Images With The Photographic Triangle

Lens Aperture Explained – Exposure Triangle Pt.1

Shutter Speed – Exposure Triangle Pt.2

ISO – Exposure Triangle Pt.3

Then work on your composition.

Digital Photography Composition Tips

Taking Better Pictures: Composition

Photo Composition - Your Photo As A Story

Good Photo Composition Is Essential

Learn Photo Composition

How To Make A Killer Photo Using 8 Simple Composition Rules

The Golden Section In Photo Composition

How To Improve Your Photography - 5 Easy Tricks

I've found these other web sites to be very informative:

EarthboundLight Archives

101 Photography Tips

50 Free Resources That Will Improve Your Photography Skills

Cambridge In Colour

Ron Bigelow Photography Articles