How to place and open doors in Terraria

Doors are a piece of furnishing that separates the inside of a house (for example) to the outside world. To open doors, you simply need to use RMB. Both closing and opening (by default) are binded to the RMB. The placement of the doors isn’t tricky as well as you just need to LMB the lower or higher attachment point. Just make them and place them, it’s just as easy as 2x2 in Terraria. The answer is 4 by the way…