First of all, adjusting the front is a skill of carrying a pen and controlling it. The so-called forward adjustment is to change the running direction of the brush when writing, commonly known as reverse adjustment. China's calligraphy pays attention to the first and last strokes of the pen and the front tone of the stroke turning point, and at the same time, it takes into account the fluency of writing in the writing process to avoid the formation of nodes, so the middle front tone of the pen is less. The main reason for using the front tone is that it is not convenient to use the central stroke when writing only one side, and it is not convenient to destroy the stroke form by force. Because if you don't use the front tone, the pen tip will only fall on the paper with sides from beginning to end, which will make the strokes very awkward, and the strokes you write will be very flat and have no thickness, so when you start writing, you will touch the paper with the side, then twist the pen to the right by twisting the tube, and then twist the tube again when closing the pen, so that you can use the center without affecting the writing fluency, and at the same time make the strokes round and thick.
Then, because of the skill of adjusting the front, the strokes of Liu Ti and Yan Ti have small protrusions. There are two ways to adjust the front: pushing the pen and changing the front. As the name implies, pushing the pen holder is to push the pen holder to the upper right after using the pen, so that the pen tip running from the upper left can be turned to the lower left, which is relatively labor-saving and simple. However, when Feng Li changed his face, he had to lift the pen after the stroke, and then reverse it with the other side when changing direction. Indexing takes more effort than pushing the pen container, but this way can save time and make the pen container stand upright, making the formed strokes more exquisite. However, observing Mo Bao written by Yan Zhenqing and Liu Gongquan, we can see that there are many small bumps in the strokes. Because in the Tang Dynasty, people no longer pursued the smooth and delicate calligraphy style, so they chose the brush pushing technique to make the strokes more cadence.
Finally, when writing calligraphy, there are many different strokes and techniques. Different strokes and techniques will lead to different stroke forms, and the popular calligraphy styles in each era are different, which eventually formed the history of calligraphy today.