It's good to know wild edibles, of course. And I do try to memorize and identify every unknown plant, tree and mushroom I can find. However, one can spend decades studying it and still would starve.
If you want to live off the land, you need a staple food.
https://academic.oup.com/ajcn/article/71/3/665/4729104 ''These and similar data indicate that hunter-gatherer societies typically did not rely on many wild plant species specifically for energy. Rather, they had
one or a few dependable wild staples (some also good sources of protein) that provided much of their energy needs. In nature, any dependable source of digestible energy is generally rare and when discovered is likely to assume great importance in the diet. Animal foods typically are hard to capture but food such as tree fruits and grass seeds are relatively reliable, predictable dietary elements. Furthermore, humans come from an ancestral lineage in which plant foods traditionally have served as the primary source of energy (14, 15). All else being equal, digestible carbohydrates are the most expedient way for humans to obtain glucose, the preferred fuel for the anthropoid brain and one source of glycogen. Humans are quick to appreciate the value of reliable energy-providing staples and will work hard to ensure a steady supply of them.''
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Acorns are my favorite for a staple food. I haven't found anything better. This idea that they are hard to process has got to stop. All it takes is de-shelling, and boiling them once or twice to get the tannins out. Then you have the best carbohydrate-fat quantity nature gives. I did it last year, I plan to do it much more this season. Acorns are awesome.
If I had to live off the land anywhere in the world, I would pick a nice, Lush, temperate deciduous forest with plenty of white oak, a cabin, with all the tools I need for acorn processing, and plenty of creeks for fish traps, other seafood, fowl, and generally a low human population, or melting nuclear powerplants nearby. Too bad nearly all deciduous areas in the world are quite populated. It makes sense, because it's well suited for civilization. The Boreal forest is much harder, so if you want wildernes and fewer people, you go to the Boreal areas. But, there to survive off the land is much harder.