Let me recommend some good books to you. Ancient books: Biography of Old Tang Book (other parts are too long to read); Ji Tang's History as a Mirror (highly recommended! ! Modern works: Zhang Guogang's Study of the Tang Dynasty's Fanzhen, and Wu Zongguo's Study of the Political System in the Prosperous Tang Dynasty.
Popular reading: "Tang Shi is not like smoke" (it is better to look at it directly as a mirror)