I'm amazed at the amount of learning that people have to do in order to survive off the flora in a new location. We're mostly spoiled in the modern world by how much the plants we eat are transparent in the preparation needed to eat them.

Being able to come into some new biome, figure out through trial and error what can be eaten when and how, and then transmitting that information reliably to the next generation is what let humans spread all over this planet.

I highly recommend the book The Secret of Our Success covering this and several other topics.