What is the most authoritative way to write hard-pen calligraphy?

At present, the "five-finger writing method" is commonly used in writing. The specific writing method is: hold the pen tube, ring finger and little finger together with the thumb, index finger and middle finger of the right hand, and gently push them against the pen tube from the inside out. The requirement of writing is to be "virtual". The so-called real, that is, the five fingers should be held by Qi Li, and the pen should be firm and realistic; The so-called palm deficiency means that the palm should be naturally empty (the palm can hold about an egg). Pay attention to the tightness of the pen. Small letters are tight, cursive script is slightly loose, and running script and official script are important. Generally speaking, it is a wrist movement when lifting a pen.