Some of the big ones to me are
CPR/AED use, tourniquet application, burn treatment, how to deal with drunk people and hangovers, recognizing signs of stroke and drug overdose etc.
This doesn’t really relate to flash cards but learn how to make calls to 911/your equivalent emergency number. An emergency should not be the first time you run through making a call like that. If someone drops to the floor right where you are, what is the location you’d give to an operator?