What are the characteristics of Li Bai's and Du Fu's poems?

The prosperous Tang Dynasty gave birth to two great poets in the history of China ancient literature, Li Bai and Du Fu. Their poems reflect this era of prosperity and crisis, prosperity and suffering from different sides and angles in different styles. Li Bai's poems and songs, with surging momentum, strange and magnificent imagination, fresh and natural language and elegant and unconventional style, express the embrace of saving the world, show the spirit of despising the powerful, resisting the ethics and fighting for individual freedom, expose the darkness of social politics and become a mirror reflecting the spiritual outlook of the prosperous Tang Dynasty. Du Fu's poems are the history of poems before and after An Shi Rebellion. When he was worried about his country, he condemned the war and sympathized with the people. He is good at combining the disasters of the times, the discrediting of people's livelihood and personal misfortunes and expressing them with typical examples. Therefore, his poems are deep in emotion, profound in meaning, profound in brushwork and vigorous in language, forming a "depressed and frustrated" style. Moreover, because he is good at making the past serve the present, he can "learn from the strengths of the past and the present and learn from everyone's merits" (Preface to Du Jun's Tomb by Yuan Zhen) and become a poet who not only integrates the achievements of predecessors, but also opens countless methods for future generations.