Soap: I know how to make it and when to use it.
I know how to provide a clean environment for childbirth.
I know how to suture a wound and keep it clean. A mild vinegar solution is an excellent antiseptic and useful as an irrigating solution to combat many infections. I know how to make vinegar.
I can make a solution of honey and salt to combat dehydration from dysentery. Lot's of children's lives saved there.
One thing Baron Steuben or Von Steuben did for American armies was he made them go to the Prussian system of putting the latrine on one side of camp and the kitchen on the opposite.
That was one thing they did know how to make and use.
The problem was the dung all over the place made it nearly impossible to keep wounds clean.
I know how to suture a wound and keep it clean. A mild vinegar solution is an excellent antiseptic and useful as an irrigating solution to combat many infections. I know how to make vinegar.
Contrary to popular belief, many ancient cultures used honey and wine to treat wounds. They also made poultices to treat infected wounds.
A lot of our modern medicines are simply refined herbal remedies which isolated the essential elements.