I took a one-day emergency medical treatment course a few weeks ago. Instructor was a young fireman. The course was taught at my gun club. I took it as it was recommended by the trainers at my club when I was qualifying for the action range.
Seemed like a good idea. Cost me $100 or so.
I was skeptical, initially about the value, the efficacy, of a one day course. I asked my little brother's opinion. He's spent about 50 years in emergency medicine. Volunteered rescue squad as a kid and then a career in emergency medicine, the fire department, including running a large urban district, and then helicopter rescue squad member, again, after retiring from his state job.
The point, he explained to me, is to teach an average Joe, that'd be me, how to keep someone alive until the EMT pros turn up.
I think the answer to the question above is a tourniquet for stop the bleed, an Israeli bandage for compression, gauze for packing a wound, and a CPR mask.
(To include the paper cut, two bandaids.)