The Whole People Survive Primitively, and I Rebuild Civilization!

Everyone around the world was thrown into a primitive world without electricity, gunpowder, and paper to survive. Here, without any tools or clothing to protect the body, humans can only rely on their own bodies and the knowledge in their minds to survive in the most barbaric way. Civilization no longer exists, order collapses, the weak eat the strong, and the winner is king! Yan Zhe lit a fire. A reminder appeared in my mind: '[Drilling wood to make fire] Experience value +1'