Reading the Graph
Chimping is when you don’t use a Light meter but determine exposure based on what the image looks like on the LCD. This isn’t the best way to shoot because its so difficult to tell exactly. Checking your Histogram will help you get the best results without using a Light meter. This chart shows how much detail you are getting in the light and dark areas, see how to read it accurately to make sure you’re getting the right Exposure.
Sometimes when you are shooting a photo that has a stark Contrast between the light and Shadow you will have a little bit of clipping due to the camera. In that case its up to you to decide which area you want more detail in or if adding some type of fill will solve the problem.