I recommend two people, one is Cai Xiang in the Northern Song Dynasty and the other is Shen Zhou in the Ming Dynasty.
official script
There are more people who write well
Semi-cursive/running/calligraphy (China's calligraphy)
The best are Wang Xizhi and Mi Fei.
cursive script
Xu Zhang
Seal character
This is special, and there are many people who write well.