Number Two:
DO NOT PLAY POKEMON GO AT NIGHT. Even if you are with a group of people, remember that it's dark, so your vision is slightly impaired, especially if you're all looking at your screens. If you have to play in the dark, do it at a location that is INDOORS. it is easier for robbers and criminals to hide in the dark and attack unsuspecting victims who are all glued to their phones.
Number Three:
DO NOT WALK WHILE LOOKING AT YOUR SCREEN! The majority of Pokemon Go players stare at their phones while walking around trying to find Pokemon. You are going to walk into a pole. Which will result in your pain and everyone laughing at you. Pokemon Go is designed so that you don't have to keep your eyes on your screen to find Pokemon. Most people playing have phones. There is an option to have your phone vibrate when a Pokemon is nearby so you can put your phone in your pocket and not worry about looking constantly. If you keep your eyes glued, more serious things can happen, such as you walking into traffic, walking off cliffs, walking into obstacles, or injuring yourself(twisting your ankles, breaking bones, tripping and hitting your head, etc.) by falling.
Number Five:
Don't call 911 to get into police and fire stations! Okay, most people have common sense and don't do this. But some people call 911 with fake emergencies to get the police and firefighetrs out of the firehouse and police station to be able to get in a catch Pokemon. It's silly and, above all, hogs up the phone lines. You may be forcing someone who really does have an actual emergency to wait because all of the operators all receiving fake calls from Pokemon trainers. yes, it is possible to be put on hold when calling 911 if the lines are all occupied.
Number Six:
Don't hang around inside your police station and firehouse for the Pokestops. You don't have to actually be inside the building to get the Pokeballs and things, and it annoys the people working inside of them. It can also disrupt their work.