This originated from the feudal era in China, where Confucian ideas were "carried forward", and people paid special attention to feudal ethical theories and put them into practice. Spring Festival is an important festival in our country. Family reunion can enhance family ties, family reunion can enhance friendship, and other things become secondary. At that time, social productive forces were underdeveloped, and banquets from time to time needed to be prepared in advance. There were several "no's" you mentioned above. At the same time, some aspects are also related to feudal concepts, such as "parents are suffering from flesh and blood", and they are injured and unfilial, so they can't move easily (this is the reason why Cao Cao cut his hair to make amends). Later, people's ideas improved, but these ideas remained more or less. For example, you can't shave your head for the first month. There is another saying in our place: "Shaving your head to death in the first month" is actually a lie to children to stop them from doing it again. (Please forgive me if the above content is not comprehensive enough)