Key points:
1, direction: upper right to lower left.
2, radian: not too big, not without, slightly curved.
3, the pen is brisk, and the pen is out.
4. Observe the direction and length of oil skimming and adjust it appropriately.
As for sketching, it is better to be straight than curved.
Sketch is also a skeleton stroke, even if it is short, it will often affect the font of the whole word.
In off-drawing, except vertical off-drawing, all other off-drawing should be' slightly straight', which we call "rather straight than curved".