When using chopsticks, there are folk beliefs and taboos for children to learn to use chopsticks. For example, the hand with chopsticks should be placed in the middle, otherwise the future marriage will be too close.
It is also not allowed to pull chopsticks on the table, like leaning on a mourning stick, to be discouraged. It is also not allowed to raise your fingers and say, "The first one refers to the elder brother, the second one refers to the younger brother, and you should be dead in the middle." It is called "Nu". Nobody believes it now. [1]
