Lefty friend about guns
(media.kotakuinaction2.win)
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First aid is as simple as a tourniquet for limb bleeding, pressure on bleeds, maintain an airway if clogged (ie turn them on their side unless neck injury), and chest compressions if they have no pulse.
Beyond that there is not a lot you can do with no equipment.
Ya it's more like use normal hand pressure unless you are unable to stop it with all your force, then use a tourniquet as tight as possible on the limb.
Like 90% of the tangible benefits of first aid training are down to CPR, keeping people going long enough for proper life support/resuscitation is a big deal.
Aside from preventing a few niche injuries like crush syndrome, the rest is either only minor benefits or so obvious/common-knowledge that you don't really need training to mostly get the right idea.