I‘m thinking for example how to do the Heimlich maneuver on others or on yourself, what to do during an earthquake and similar things.
I‘m having lots of fun learning new things with Anki and thought a deck like this would be a good addition. Of course hoping I won‘t ever need to apply any of it.
Stop the bleed, CPR, general first aid via whatever local resource you have (like red cross, but anyone reputable will do).
That’s going to handle any realistic scenario you’ll encounter that wouldn’t need more gear than you can carry in a small toolbox.