Edible plants are something I have always been interested in. The Native Americans used hundreds of different plants that we now pull up as weeds. A friend sent me the internet addresses of two good YouTube videos. If you follow these links they will lead you to dozens more. This is an excellent resource on edible plants. But like anything else you have to use your head. Try and find someone in your area that is familiar with the plants and is willing to teach you. Be careful what you eat it could be the death of you.
In the near future I intend to post a detailed article on the use of acorns.