Yep, I know how to prepare the acorns to make a quite palatable flour. Not all acorns are good to eat, so you need the right varieties. None are actually poisonous that I know of, but some taste really bad, and unless you leach the tannins you'll be constipated! The oaks have a lot of other uses too, tanning, dyes, medicine, hosts for edible symbiotic fungi, food plants for other useful creatures, and of course wood and fibre. My own taste is more for beechmast, but it's harder to gather. And pine nuts, of course.
Here in Australia the plants grown like that in the desert are mainly Santalum species (quandong, sandalwood). They don't look farmed, not in straight lines (though I do remember seeing one lot out north of the Breakaways that ran perfectly straight for more than a mile, because it was following a straight crack in the rock, and the seeds had been planted along the crack where the soil and water were. Because these plants are hemiparasites, some of their host plants had been put alongside.
Then there was firestick farming, which was used in the forested areas and in spinifex country. This used controlled burns, usually in winter, to stimulate new growth and in the case of open forest country, to keep it open. It encouraged grass growth which drew grazing animals to where they could be hunted, and also the regrowth and seed germination of edible plants.
Poll
