What does it mean to advocate new literature and oppose old literature?

Therefore, Chen Duxiu and Hu Shi's opposition to the old literature in the literary revolution refers to Confucius' Confucianism, and is aimed at feudal literature that binds people's thoughts, such as the Four Books and Five Classics.

The New Culture Movement advocated new literature and opposed old literature. Stylistically, the old literature is classical Chinese, while the new literature is vernacular Chinese. From the content, the old literature is stale and the new literature is novel;

The new literature of the New Culture Movement refers to "vernacular Chinese", which is more written in classical Chinese than the old literature at that time.