My input....
If you plan to go shooting on a free or public access range, I'll post a few points. I'd add that you should wear shirts or sweatshirts that are NOT open collar, V neck, etc. Hot brass can go flying down a shirt & be a major safety issue. It happened to my good friend in 2009 with a PX4 9x19mm and a woman in SW Florida shot her fiancé with a semi auto pistol, when her spent case flew down her top.
A: Keep your area clean & pick up any trash, cans, boxes, paper plates/targets, etc. You may or may not be the cause of all the trash there but it's better for you & the next shooter(s).
B: Bring a first aid kit or have the EMT stuff ready to provide aid. You don't have to be a ER doctor or a USAF ParaRescue trooper but a kit can help with minor cuts, scrapes, etc or a gun-shot, snake bite, etc.
I've seen a lot of hairy stuff on ranges. I served four years in the US military & went on public/private ranges as a armed citizen. Be ready for emergencies or first aid issues.
C: Know & understand the range rules/SOPs BEFORE you go shooting.
This is a simple point but many ranges/staffs have ticky-tacky rules or regulations that could be a hassle later. Be aware of any special rules & know how to alert the range master or park ranger if required.
Gun owners & shooters should be friendly & open but some on public ranges are not.
D: Don't bring distracting music, toys, pets, small kids, etc. Be considerate of the other range shooters. It's not a beach or a park. Keep the safety rules in mind.