Why can't you write a line straight?

Whether a word is well written depends on the cultivation of calligraphy skills.

But if a line of words is not correct, it is mainly the problem of sitting posture.

Pay attention to sitting posture, don't tilt your head and don't be too low. In addition, we should cultivate the overall view and pay attention to the overall situation when writing every word. To achieve these two basic requirements, you can definitely write directly.