How many kinds of brush calligraphy are there?

It can be roughly divided into real books, running scripts and cursive scripts. There are running scripts and cursive scripts, and cursive scripts include today grass and crazy grass. Regular script is the most popular and practical font, including Yan style, European style and Liu Ti. There are official script, seal script and Zhong Dingwen. Official script is very interesting and decorative, and regular script evolved from official script; Seal script is divided into big seal script and small seal script, and now it is mainly used for seal cutting.