Which books are a good choice to buy books to learn soft pen calligraphy?

The practice of Yan-ti characters should start with multi-pagodas, rather than writing diligent tablets as beginners. "Multi-tower" is a style in the early Tang Dynasty with strict structure. The strokes are accurate and easy to use. "Diligence Monument" is Yan Zhenqing's work after the age of 60. It has completely lost the rigor of the early Tang Dynasty and replaced it with cheerfulness, atmosphere and fullness. From the practice of "multi-pagoda", you can go up to the second king and learn from Su, Huang and Cai. All three families study Yan except Mi. Therefore, apart from the two kings, Yan is another master who started the school. He created another brushwork: leak marks.