In fact, the current calligraphy atmosphere is not good, and various styles and faces are mixed. I suggest you buy books written by famous domestic teachers, such as First Man, and tian teacher's books Calligraphy Tutorial, Composition Tutorial and Structure Tutorial are all good. There are also some calligraphy tutorials by Mr. Qi Gong, or by Mr. Ouyang Zhongshi and so on.
The representative works of these people are available in Xinhua Bookstore, JD.COM Mall, Dangdang Mall, Zhuo Yue, etc. If they are not too pirated, they can be found on Taobao. Hehe, I hope you can choose what you are satisfied with. ?
Attached to the picture of Mr. Tian's work: