Seek famous calligraphers in ancient and modern times (official script, regular script, running script).

You are talking about an all-round calligrapher. The most famous figure in ancient times was Zhao Mengfu, who had "Liu Tiqian Wen Zi".

Modern famous all-round calligraphers include Wu Hongqing, Xu Liming, Huang Yun, Wang Yong and others. These people have systematic and comprehensive calligraphy teaching videos on the Internet, with explanations and demonstrations in place. They also have a seal cutting level that Zhao Mengfu doesn't have. Zhao Mengfu always carved words on stones for craftsmen to carve.

Typical examples of incomplete calligraphy teaching are lectures by teachers and professors of Beijing Normal University, the calligraphy department of Beijing Normal University or the calligraphy research institute, which are also available online and sold by Xinhua Bookstore. You can have a look.