The title is a bit over dramatic but, per the title, if you could contribute with one piece of knowledge to a book that every single individual should learn from in order to kickstart a civilization, what would be yours?
My personal choice would be the process of soap making, from scratch.
Yes of course. With all vested powers I dub thee Venicon, Librarian Most High, Director to the Book. We only have the one, but it is quite good.
Welp, looks like my LinkedIn is getting an update.