As has been said, it's all very well to load up with the fancy kit, but knowing how to use it is far more important, so if ever offered first aid courses on any level, especially if works paying for them, take them, you might make all the difference one day.
To the same degree, within reason, someone with training can utilise all sorts of non medical items in order to stabilise a situation, case in point, when a colleague of mine had been shot, properly shot lol, standard wound dressings wouldn't do the job, but packing the wound with my own Compton & Webb beret stopped him bleeding out.
Fucker still owes me a new beret 🤬