Lowe's, Home Depot, etc. have various things to help with it. I've used this putty that you can mold into the scratches, smooth it out and then sand it away and stain if you want. It works well for cracks as well. They also have these pencils that you can use to just color away the very light scratches. That also works well.
If you have more elaborate scratches you might need to sand it down a little to smooth out the edges and then proceed as normal.