Extreme Survival Rules

Wang Xuan traveled to a prehistoric primitive tribe alone with the MC system. What should he do? I am also very conservative, and I just want to live a good life and teach primitive people how to improve their happiness index in life. But who can tell me what those things that looked like three cargo planes flew past in the sky just now! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.