What does the ancient method in calligraphy mean? I want a comprehensive answer.

First of all, we must clarify the word "ancient". The previous history in a broad sense is "ancient", and in a narrow sense it has a history of more than 100 years. "Ancient law" generally refers to the sum total of calligraphy norms handed down in the history of China. In this process, we saw the development of calligraphy art from Oracle Bone Inscriptions to Cao Zhang. ...