The former includes several major stages, such as Jian 'an Literature, Western Jin Dynasty Taikang Literature, Eastern Jin Dynasty Literature, Southern Dynasties Literature and Northern Dynasties Literature. Then its era characteristics are that it has been in an era of frequent separatist regime changes, sharp ethnic contradictions and great ethnic integration for a long time, and many literati have also been involved in political struggles. During this period, Confucianism gradually declined, metaphysics rose, and Taoism and Buddhism prevailed. Its main feature is the arrival of the era of literary consciousness, which makes a detailed distinction between literary genres and pays attention to the combination of literature and philosophy.
You should know better about the latter, Tang Dynasty and Song Dynasty. Although there were periods such as Anshi Rebellion in the middle, it was still a relatively stable environment on the whole. The key point of learning is that the enlightened literature development of prosperous politics in Tang and Song Dynasty is in a period of rapid development, which is characterized by attaching equal importance to inheritance and innovation. Literary creation and folk creation coexist with poetry and other styles.
So they have their own characteristics, one is the meticulous division of genres, and the other is the heyday of poetry. Feel your own interest direction
I hope my answer can help you ~!