My heart is: there is no definite way to write, wrist is the key, it is best to hang your elbow to write (except lowercase letters), and you should know how to move your wrist instead of elbow.
Calligraphy depends on practice, but you can't just practice without remembering. Beginners should not deliberately pursue brushwork, but practice shelf structure and remember them. What is written in this post and what is written in that post?
In addition, we must choose those famous inscriptions. If you are a child, you can start with regular script. If you are interested in calligraphy, you can start with any style.