Every craft leans on the one before it
You start with empty hands. Pull fibre from the grass, pick up sticks and loose stones, twist cordage, knap a flint knife. From there every craft leans on the one before it: a kiln before charcoal, bellows before bronze, a bronze saw before a single plank. Stone gives way to bronze and bronze to iron, and the Crafts screen shows what you can make now and what you are still missing.