Yes and no.... There are 4,000 edible species in North America. Learn the two or three dozen best dozen for your area. I've been foraging for over 50 years, and I teach it. (Got a site and over 50 videos on You Tube. Click on my blog.) Botany in a Day is a good book -- is one of my 40 or so -- but it is limited to plants in the Idaho region.If you have any interest at all in edible plants, you need to know the correct step, by step way to identify plants in general first.
The best book to learn that skill is called Botany in a day (search Amazon.com).
The book starts by ..... I am doing Botany in a day all this winter, several edible plant books next spring, and taking my field guides out to practice my skills all next summer. My schedule should have me capable of foraging most of north America unaided by next fall (according to my sister, who has already done this).