I agree that for a few "low hanging fruits" or "easily rooted vegetables", to add to your already sufficient food, foraging for fun could be, well, fun.

The romantic vision of living off the land would require a skill set that reading a few books and articles wouldn't really cover. Those who lived off the land were taught by parents and others who lived off the land, who were taught by ........

If you can get the skill set from books, be sure to let us know, however.