Tribes & Indigenous Cultures - 56 free documentaries about tribes & hunter-gatherers.
Start with The Congolese Tribes Selling Weed to Survive (42 min, VICE), then The Filipino Tribe That Lives Inside a Volcano (52 min, Free Documentary). All 56 documentaries here are free to watch from their makers' official uploads. To read deeper, the top-rated book on tribes & hunter-gatherers is The World Until Yesterday by Jared M. Diamond.