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Generally, know somebody.
I spent my childhood winters learning how my father went /out/ in the old country. Summers with the only indian kid in my village, learning to forage since his family couldn't afford store bought food.
Without someone to tell you directly, I'd suggest just making a basic kit and learning by doing. Download books or videos and set your sights low.
I suggest walking to a lake, catching a trout, and cooking it over a fire. You will need a fishing rod, hooks, sinker, lighter, and a knife. Tent/hammock and blanket if you want to make it an overnight affair.
Dig for bugs or worms. Bait and cast hook. Gather dry deadwood, shave tinder while you wait. Reel fish. Gut, stake, and bleed. Start fire. Cook. Eat. Sleep.
Each of these has special techniques associated, but with exception for tying a knot you can figure it out.
