Personally, I think the relationship is both a teacher and a friend
You can choose ancient poems: Li Bai, Du Fu, Bai Juyi, Xin Qiji, etc. There are many categories of ancient poems on the Internet. It is recommended to choose lyrical, scene description, etc. , relatively beautiful; another sentence, inspirational, philosophical, such as Zhu Xi's.
You can choose modern poetry: Mao Zedong's poems are very powerful and most people like them very much. With the instructor, they are motivating and the spirit of hard work can be demonstrated; classic poems by Xu Zhimo and Lu Xun, etc. Personal opinion, hope it helps!