What are the types of ancient poetry and what are the representative works?

Ancient poetry is an important tool for ancestors to express their thoughts, feelings and promote production. It came into being in primitive times with extremely low productivity, and it is the earliest literary style. According to the theme, it can be divided into labor poems (such as Ge Tan in Wu Yue Chun Qiu), sacrificial poems (such as Waci in the Book of Rites), wedding poems (such as Tun 62 in Zhouyi) and war poems (such as Zhongfu 63 in Zhouyi). They reproduce life collectively, comprehensively and directly, with concise words and smooth rhythm, and fu is their main expression method.