With regard to training. I own a large glass company and have been in the glass business my entire life. I have had on the job first aid training from minor cuts and bruises to major pressure bandages and trauma treatment. I think I've seen and dealt with real first aid. The know how seems to be basic and comes naturally, and formal training is not needed unless your in a remote area where treatment can be hours away. But you can't help if you don't have the tools.
Always carry some sort of first aid kit.