What are the masterpieces of calligraphy in the past dynasties?

Ask the people upstairs, have you ever heard of regular script four-body? There are four representatives of regular script: Ou Yangxun (European style), Yan Zhenqing (Yan style), Liu Gongquan (Liu style) and Zhao Mengfu (Zhao Ti). The running script needs no explanation, Wang Xizhi's Preface to Lanting. Zhang's cursive post, Huai Su's self-narrative post, Zhang Zhi, Sun and Zen Master Zhiyong are all very good. Official script: Cai Yong's Xi Shi Ping Jing. There are three kinds of seal characters: jade rib seal, iron line seal and clear seal! The representative family of Yu Jin Zhuan is Li Siyi Mountain Monument in Qin Dynasty, and the representative family of Tie Xian Zhuan is Li Gan Gua Monument. Deng, Zhao, Zhao and others are all masters of seal script!