What should be the meaning of the poem with Dudu and who wrote it?

[Modern] Chairman Mao's "Qinyuanchun·Changsha": In the cold autumn of independence, the Xiangjiang River goes north to the head of Orange Island.

[Five Dynasties] Li Yu's "Lang Tao Sha Ling·The Gurgling Rain Outside the Curtain": Don't lean on the railing alone, the country is unlimited, it is easy to say goodbye and difficult to see.

[Qing Dynasty] Gong Zizhen's "Writing Dreams on Langtaosha": Being alone in desolation, I still relieve myself, and control my sorrow of separation.