Another thing that I relate from personal experience being corrected on something: Don't Be An Asshole
When I first started shooting skeet I was unaware of the rule about not dropping a shell into a broken open gun before stepping into the firing position box. It is not unsafe, and would be acceptable in the field, but it is a rule you are expected to follow, and when you walk onto a skeet field anywhere it is something you should expect people to be doing. And I would have appreciated this being pointed out to me by another rational, helpful adult, rather than the (ETA: old) confrontational dickhead that thought he needed to set me straight. In the following decades I have explained the same rule to many people, and have done so in a manner that I would not expect to tamper their enthusiasm for the recreational activity, doing my best to be the Anti-Dickhead...