Why will using a tripod make your pictures better?
No matter how hard we try, our hands are never totally still. If you are taking a long shutter time picture (when the shutter doesn't click real fast, it takes a few seconds), ANY motion of the camera will create a blur on whatever you are shooting.
Even with fast pictures, sometimes your hands will move a teeny bit and cause a blur. Especially if you are zoomed in pretty far. For example. If your hand moves one millimeter, it will create a blur. But if the camera stays still, you can easily get a shot of a moving object without any blur. The further away the object is that you are shooting, the more steady you want your camera!