
Ahn Sarang:
Oh, I had a suggestion but forgot to post... My bad, I'll do it the next time then
We can go with yours. Seems like nobody has a title for mine. I cannot think of the titles but many times I have seen the Heimlich manoeuvre done, so wrong. That hasn't been taught in first aid classes for the last 20+ years, if done it could actually cause the blockage to move further down the wind pipe (making removal much harder) or break a bone. If someone is bleeding, stop shaking the person doing the bleeding, apply pressure, if you don't have fabric, use the bleeder's hand if they are conscious enough to apply sufficient pressure. If it there is a stab wound, don't pull the knife/implement/thing out. Put a donut bandage around it, wrap it tight to keep it steady then to hospital asap. If there is a suspected spinal injury, unless the situation is about to get more dangerous (like the car is about to blow up or another serious threat is on the way) STOP moving them, wait for the trained medics. Many times I have seen nosebleeds treated by tilting the head back, so not ok. Sit down, lean forward, pinch the bridge. If that isn't working, a tampon up the nostril works alongside a cold pack on the back of the neck.
I saw a drama where the guy had sulphuric acid splashed on him and all they did was dab at it with who knows what, ages after the incident. Straight under running water for at least 20 minutes then consult a medical professional.
Oh, brown paper bags for hyperventilation hasn't been done or taught for so long. Sit the casualty down, speak calmly, reassure them, check for medical alert bracelets or cards, wait with them until they are properly past it or call for medical help if severe or if the casualty isn't calming down.
That said, GET proper FIRST AID TRAINING!! Approach work or school to offer it for free or heavily subsidised. Volunteer with an organisation that will get you training at their expense. Study anyway, find a reputable source online, study and practice with friends &/or family.
There are heaps of other things that bug me but I cannot remember them and this isn't the space for it. Let's go with Ahn Sarang's suggestion when s/he posts it.