What is the basis of practicing brush calligraphy?

Hairstyle's personality: horizontal and vertical, up and down (quite different from that advocated by traditional calligraphy), Fiona Fang's combination, broken strokes (if you look at more hairstyles, you will find that the strokes are random and frequent, but the strokes are flowing), and the unique bending hook makes the hairstyle brilliant. Describe more, experience more, and be complacent.