Imitation-refers to imitation, that is, you can put paper on the original calligraphy for imitation practice.
Miaohong-China used to practice brush calligraphy, which was red. Every other page is in red standard script with a thin layer of transparent paper on it. The yogi draws the scarlet letter, which is called tracing the red. It's basically less now. Hong Miao is usually a nine-square grid. )
The above three methods are all used by calligraphers in China, but there are others, such as rubbing and practicing with water.