11. Holding The Door
If you approach a door and someone is following you, hold the door for them.
If the door opens by pulling, pull it open, stand to the side, and allow the other person to pass through it first, then you can walk through.
If the door opens by pushing, hold the door open after you have walked through.
It may seem like a small thing, to hold the door for someone else, but it shows respect, courtesy and cooperation which make life some much more pleasant when we respect each other and cooperate together.