Scratches are a killer of your lens. There is no good way to repair them yourself. The best thing you can do is prevent scratches. The easiest thing you can do to protect your lens against scratches is to use a filter. A filter is a small piece of glass that fits in front of your lens. The original purpose of filters was to change the look of an image. However, many people use a polarizing filter or an UV filter as protection for their lenses. These filters have generally mild effects and are useful for general photography. Keep in mind that you are putting a relatively inexpensive piece of glass on a rather expensive piece of glass. Use high quality filters to avoid compromising your lens quality.
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