Know how to write, know how to appreciate, know how to comment, know how to explain, know how to teach, that is to learn these.
I think if you want to take calligraphy as a career, you can study law and law, become a calligraphy teacher after graduation, hold some training courses, win several prizes, hold several exhibitions and competitions, and hold several positions in the association. That's it.
If you want to write first-class calligraphy, I suggest you take calligraphy as a hobby instead of studying law and law.
Because calligraphy reflects people's emotions and mental outlook, you can't write any good words without life experience. Writing requires a high level. Only when your life experience is rich and substantial can you write good words.