First-AidThe definition of the World Health Organization (WHO 1948) states:
"Health is a state of complete physical, mental and social wellbeing and not merely the absence of disease or infirmity."

Information on care of injuries can be summarized: disinfection, possibly cooling for pain and swelling, and sterile bandaging. If it is more severe, call the emergency number and seek professional help.

That makes little sense if there is no phone or no professional help.
If you want you can be better prepared to intervene in the right way: now doing a first aid course. If you need it, there is no longer time and opportunity. Below are some tips.

"From the moment you buy a first aid box you start to get accidents." (George Mikes)

Take at local cooling care for freezing of the skin. Never put ice or compress directly on the skin. Put a (sterile) cloth between.

Urine is sterile and rather acid, and can if there is nothing else available be used to disinfect. Garlic also disinfects.
Larvae of the green bottle fly (Phaenicia sericata) are accurate surgeons. They only eat dead tissue in a wound and leave the healthy tissue alone. That makes a drastic reduction in the breeding ground for bacteria. They also produce substances that accelerate the recovery of the wound. (But they can also transfer diseases.)

The mere fact that a healthy dares to ask money to a sick, says enough about doctors. (Simek)