What are the two teachings of poetry?

Romantic poet Li Bai, realistic poets include Du Fu and Bai Juyi. In the late Tang Dynasty, there appeared a group of realistic poets who inherited the spirit of the new Yuefu in the middle Tang Dynasty, with Pi Rixiu, Nie and Du Xunhe as the representatives. Their poems are sharp-edged, pointing to the disadvantages of the times.

Bai Juyi, a realistic poet, and the New Yuefu Movement, the literature of the Tang Dynasty with the Anshi Rebellion in 755 as the dividing line,

With the rapid changes in social economy, politics and military affairs, great changes have taken place. This change, on the whole,

From romanticism to realism. Du Fu is the standard-bearer of this change. Of course, Li Bai and Du Fu pushed to the top.