Food & Drink - 28 free documentaries about factory farming & meat.
Start with The Meat Lobby: How the Meat Industry Hides the Truth (52 min, ENDEVR), then If You Eat Meat You Should Know This (16 min, Kurzgesagt). All 28 documentaries here are free to watch from their makers' official uploads. To read deeper, the top-rated book on factory farming & meat is The Omnivore's Dilemma by Michael Pollan.