Curtains are mainly used to decorate families, and the length requirements are slightly different according to your preferences and living habits.
For example, some people like to make curtains flush with the window sill, while others like to make floor-to-ceiling curtains. Floor-to-ceiling curtains Some people like to be higher from the ground (5-6 cm to prevent mopping and getting dirty), while others like to be 1-2 cm from the ground.
Home feng shui is generally related to the orientation of the house, the orientation of the windows and the furnishings. It should have nothing to do with the length of curtains.