First horizontal and then vertical, first left and then down, from top to bottom, from left to right, from outside to inside, advanced and then closed, first middle and then sides, first inside and then sealed.
The physical structure of Chinese characters can be divided into four levels: Chinese characters, components, strokes and strokes. Chinese characters are the highest level, components are the intermediate level, strokes are the second lowest level and strokes are the lowest level. The basic strokes of Chinese characters: point, horizontal, vertical, left, press, lift, fold and hook.