What is the theme of Du Fu's poems? What are his famous works?

His poems boldly exposed the social contradictions at that time, profoundly criticized the rulers' sins and showed deep sympathy for the poor people. Being good at choosing social themes with universal significance reflected the political corruption at that time and expressed the people's wishes to some extent. Many excellent works show the historical process of the Tang Dynasty from Kaiyuan to Tianbao to division and decline, so they are called "the history of poetry". In art, he is good at using various poetic forms, with diverse styles, mainly depressed; The language is concise and expressive. Inheriting and developing the excellent literary tradition since The Book of Songs has become the peak of realism in China's ancient poetry, which plays an important role in connecting the past with the future. Poems such as Military Vehicle Shop, Memorizing 500 Words from Beijing to Fengxian County, Spring Hope, Qiang Village, Northern Expedition, Three Farewells, Autumn Wind Breaking Cottage, Autumn Prosperity are all told by people.