What is the correct writing method of hard pen calligraphy, and how should it be exerted?

Writing with a pen is the easiest way to grow cocoons. Even if you hold the pen correctly, it will still grow cocoons, because you have to work hard to write. Since we have to work hard, it is inevitable to grow cocoons. The correct pen holding posture should be that the thumb and forefinger are roughly flat, the middle finger is next to the forefinger, and the other two fingers are attached to the inside.