How did Song Poetry prosper?

The prosperity of the Song Dynasty is closely related to the development of poetic theory in the Song Dynasty, which is mainly reflected in the emergence of a large number of "poetic talks". Poetry talk, recording anecdotes, evaluating gains and losses, researching historical facts, or expounding theories, in a few words, is a form of literary criticism with national characteristics. Of course, there is a tendency to be too rigid in the "poetic method", but if we say: "Tang people are good at poetry, but few poems; Song people left the Tang Dynasty, but there were many Tao poems (Poems Around the Furnace), but there were too many. It should be said that the prosperity of poetry theory has more advantages than disadvantages in discussing the aesthetic characteristics of poetry.