Question: what every man must know?
Answer: Basic Carpentry. Carpentry is one of humanity's oldest skills. ... 
Basic First Aid. Apart from perhaps finding water, basic first aid is probably the most important survival skill to have in anyone's repertoire. ... 
Build A Campfire. ... 
Build A Shelter. ... 
Buy A Suit. ... 
Catch A Fish. ... 
Change A Tire. ... 
Change Your Oil.