Beginners should start with lettuce and herbs, then tomatoes and peppers and other fruiting plants. Cannabis works too but most beginners care so much for their cannabis plants that they usually fuck them up along the way. Drying and Curing is an added hurdle.
As far as only two crops to grow to live on, I assume you just mean as food direct to my table, and not to sell or trade. If so, probably sweet potatoes and broccoli. That should pretty much cover me on plant based nutrition. The cows and chickens would fill out the rest, and they can just pasture and do their thing.
If I'm selling my product, it really depends on the market, and how much land I have. Right now, probably cannabis and mushrooms, like shitake or oyster. Very high price per dry ounce, and don't take a ton of room to grow. Side benefit of having spent mushroom compost for growing the cannabis in.
If I had a ton of land...hemp and wheat.
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