Du Fu is ten years younger than Li Bai! So he was in the late Tang Xuanzong. Because Tang Xuanzong loves Yang Guifei! More and more incompetent! The situation in the country has turned from prosperity to decline! Du Fu was in that period! So his poems focus on reflecting reality! Many of them are dissatisfied with society and cruel reflection on reality! He is ambitious, but it is a pity that there is no hope of serving the country! I feel that I am in the same boat with Lu You in the Southern Song Dynasty! Therefore, life is bending and ending!
In short, Li Bai's poems are heroic and Du Fu's poems are tragic!