In this tutorial, you'll learn how to event doors that are on the side walls of your game, such as door leading to rooms to the left or to the right. These events will have the player open the door and upon leaving the area, the player turns around and shuts the door.
(also, if you want to match the ascetic used in this tutorial, you can use Yanfly's Grid free doodads like I did. Although there is a number of ways you can accomplish this look, such as events set to above character)