Want to learn hard pen, I recommend the following Copybook for calligraphy:
Practice Tian Yingzhang, Lu Zhongnan, Gu Zhongan and Qian Peiyun in regular script;
Running script exercises were inherited by,,, Shen Genhong and Gao.
Calligraphy follows the rules, has the flavor of the times without losing the beauty of tradition.