While you are probably shooting "good" photos using the automatic settings on your camera, learning to manipulate the Manual Settings will take your photos from good to SUPERB...
3 Terms To Remember
1. ISO: International Standards Organization
2. Aperture or F-Stop
3. Shutter Speed
Before we go any further, go get your camera manual and read it! Then practice, read the manual again and more practice.....
There are some fabulous sites you can go to for more information on increasing your photography skillset.... One of my favorites is Shuttermom University.... http://www.shuttermomuniversity.com/