Most of these words of advice should be no-brainers, but since you may very well be getting on a plane today or tomorrow, or even next week, please let the puppets from Glove and Boots give you some friendly words of advice.
And definitely, please be mindful that everything you're doing on that touch screen in the seatback in front of you can be felt by the person's head resting against the other side of that seatback.