None. Information is transmitted via stories & myths.
Usually not much more than hide and furs for protection. Shields are available in several sizes but tend to be made of less durable materials.
Stone and natural material based. Stone flake weapons, obsidian mounted into wood, nets, bolas, staffs, whips, etc.
Shamanism, Demon Idol Worship, or Witchcraft.
Simple levers, stone or natural material based hand tools.
Herbalism, sympathetic magic, trepanning, magic (as above).