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.
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All the physics and metallurgy things. I am also slowly acquiring skills in construction and farming.
Don’t forget beer making! I understand enough about distillation to probably make liquor without killing people.
You don’t need distillation to make beer though, do you?
Laws of Electromagnetism