When did modern poetry become the first?

In ancient times, poems were originally called articles or chapters, not titles. For example, the earliest book of songs in China is called "Three Hundred Poems", and Qu Yuan's poem is called "Nine Chapters". At that time, there was a poet named Sun Chuo, who wrote in Preface to Poems of Mourning: I can't wail, write a poem. A man named Zhitong wrote a poem about chatting in Preface to Taoist Poems. Since then, people generally call poetry the first.