Xingkaikai. If you want to practice, you should first practice regular script and copy copybooks, mainly mastering the frame structure and the use of brushes. At the same time, read more articles on calligraphy to understand the origin and development of calligraphy. It's better to have a teacher. After a year and a half, I will practice Xingkai again. If I want to be like that, I estimate that after 3 or 5 years, I will still be qualified. Some people will never be able to practice well in their whole life. It's not that they don't work hard, but they don't have the qualifications.