What do the four evils in the calendar mean?

Evil: generally refers to some bad things that are not suitable for doing, and sometimes it depends on the eight characters.

Four wastes: four wastes, four seasons decline. In the future, it is forbidden to go out for military conquest, build houses to welcome relatives, be feudal, worship officials, collect money and open the market. The Calendar says: Chun Gengshen, Xin You, Xia Renzi, Gui Hai, Qiu Jiayin, Yi Mao, Dong Bingwu and Ding Si.