As far as soft pen and hard pen are concerned, although hard pen calligraphy was first produced (Oracle Bone Inscriptions in ancient China and later bronze inscription), with the appearance of writing brush, hard pen gradually became non-daily. It was not until modern pens were introduced into China that hard pens gradually became a daily routine. During this period, the skill of soft pen (that is, writing brush) was honed by generations of masters, creating one "world" after another, each with its own "coquettish". The difference between them is that the brush is rich in lines and easy to change, express or express (such as emotion).
Many things in writing brush can be used to guide hard pen calligraphy. For example, the most basic brushwork, posture, structural shelf, composition and so on.
Hehe, remember to praise it. I typed this word by word, which is a summary of my experience.