Whether you shake your wrist or not depends on how big your handwriting is. If you write with lowercase letters and pillows, you hardly need to turn your wrist. If you write in large font, you may need it. If it's that kind of list, you need to straighten your whole arm.
Many people mistakenly think that writing brush characters depends on the power of fingers, but it is not. The correct way is to make full use of the flexibility of the wrist and use it to write. Beginners practice seal script, with euphemistic lines and simple strokes. When writing, the wrist should rotate slightly with the pen, and the writing level can be improved by practicing in a relaxed way.