Stop the bleeding, clean the wound, splint the break, and later operate under anaesthesia.
Stop bleeding, prevent infection, and set what is broken.
Needs first: Make water safe (Water), Fire, and keeping it (Energy)
Make surgery survivable and therefore worth attempting.
Needs first: Germ theory and antisepsis, Fermentation and distilling (Materials), Acids (Materials)
Every guide, build, reference sheet and book reached from the steps above.
Without antibiotics, a cut is a slow emergency and a deep bite is a fast one. What saves people is mostly pressure, water, and knowing which wounds must be left open.
Level 1Normal pulse, breathing, temperature and blood pressure; the signs that mean danger in a child; and how much water a body needs.
Level 1The poisonings a rebuilding community is most likely to meet: where each comes from, how it shows, and the first thing to do.
Level 3Life from the cell up: the human body, microbes and immunity, inheritance and epidemics. Each result with what it lets you do and who first found it.
Level 3The two dozen that decide who lives where there is no doctor: what each does, how it spreads, what kills it and which step stops it.
Level 3The basic set from the WHO list: what each treats, what it is made from, and the earliest tier that can make it. No doses, on purpose.