What foundation did The Book of Songs lay for China's classical poetry?

The Book of Songs laid the realistic foundation of China's classical poetry. The Book of Songs is the beginning of ancient Chinese poetry and the earliest collection of poems. It collects poems from the early years of the Western Zhou Dynasty to the middle of the Spring and Autumn Period (pre-1 1 century to the 6th century), **3 1 1 poems, of which 6 poems are Sheng poems, that is, they have only titles but no contents, and are called Sheng.