Shoot, it doesn't have to be neolithic. How many people know how to do stuff like change their oil or brakepads without watching YouTube? How many HN readers

Shoot, it doesn't have to be neolithic. How many people know how to do stuff like change their oil or brakepads without watching YouTube? How many HN readers need to search for specific commands for Makefiles -- I still do sometimes -- or how to use an obscure part part of an API?