How to take great photographs? - 1
I have a nikon d3100 i love using it but i feel like i don't know enough about the camera and how to take a great photograph
There's Way too much to cover for a Y! A box.
You need to understand both the technical aspect of photography (exposure, depth of field, aperture, shutter speed, synch speed, field of view, focal length… ) and the artistic aspect (leading lines, rule of thirds, portrait lighting, posing, rule of odds… ).
If you are a pure beginner, you might want to look at Scott Kelby's 4 book boxset. It's a great starting point.
Learn about Light, Exposure, Composition and Depth of Field. Learn to See Photographically.
LIGHT
http://photographyknowhow.com/photography-lighting/
http://photographyknowhow.com/quality-of-light-in-photography/
http://photographyknowhow.com/direction-of-light-in-photography/
COMPOSITION
http://www.photographymad.com/pages/view/10-top-photography-composition-rules
EXPOSURE
http://digital-photography-school.com/learning-exposure-in-digital-photography
DEPTH of FIELD
http://www.cambridgeincolour.com/...-field.htm
SEEING PHOTOGRAPHICALLY
http://www.luminous-landscape.com/columns/aesthetics-1.shtml
Camera help: http://www.nikondigitutor.com/eng/d3100/index.html
Good photography requires thinking so you need to begin training yourself to think about Light, Composition, Exposure and Depth of Field BEFORE you release the shutter.