A basic first aid kit is a very useful item to keep in your range bag, vehicle, home, or EDC bag. I bought an assortment of small first aid bags and have them stashed in all of those places. Just like a conceal carry pistol, it’s better to have a first aid kit and not need it, than need it and not have it.
A first aid kit is no substitution for actual first aid training.
If you have not taken some first aid classes, or it has been a while, find a local first aid basics class and take one. The Red Cross offers many first aid classes that are an excellent crash course in basic first aid skills.