My handwriting is always crooked, crawling around like a dog, with no appearance at all. It's ugly to death. Want to know how to practice writing well?

1) The right thumb is on the left side of the pen, slightly behind the index finger; The index finger is in the front right. These two fingers hold the pen tightly, the middle finger is under the index finger, and the pen is supported by the first joint. The ring finger and the little finger naturally bend to the palm after the middle finger. (2) The penholder leans to the right and back, and clings tightly between the third joint of the index finger and the tiger's mouth. (3) When the forefinger and thumb pinch the pen, the middle is oval. (4) Palm and arm are in a straight line. (5) The distance between the finger and the pen tip is about 2.5cm.. (6) When writing, the support point of the hand is on the wrist side.