Here is a bare bones photo of a Nikon D70 camera. The picture is pretty good, but could be improved in a few areas.

The photo is too dark, has some incorrect colors, has some physical imperfections, and is not in the correct aspect ratio.

A good way to start editing your photos is to adjust the light levels. Adjusting the light levels allows you to balance whites and blacks properly.

Note that each side of the level graph contains multiple peaks. A good rule of thumb is to shift the light level sliders to just before the peaks on their respective sides.