What did Su Shi use in his calligraphy?

The leader of the five families. Su Shi's calligraphy draws on the strengths of the five schools of calligraphy and incorporates his own characteristics. It not only draws on Yan Zhenqing's calligraphy, which is thick, round, majestic, and strong, but also benefits from Yang Ning's calligraphy, which is expressive, lyrical, and innocent. Su Shi's ancestral home was Luancheng, Hebei Province. His courtesy names were Zizhan and Hezhong, and his nicknames were Dongpo Jushi and Tieguan Taoist.