The mainstream of modern poetry is free verse. Free verse is the product of the May 4th New Culture Movement, which uses vernacular in form, breaking the shackles of old-style poetry, and mainly reflects new life and expresses new ideas in content.
The original meaning of "ancient poetry" refers to the poems written by ancient literati. Before and after Wei, Jin, Southern and Northern Dynasties, there appeared a number of five-character poems written by scholars before Wei and Jin, which had no title and no author. Most of them are lyric poems with unique expressive techniques and artistic styles, which are collectively called "ancient poems". The ancient poetic style before the Tang Dynasty is a poetic style that does not pay attention to meter and has no limitation on the number of words and sentences. After the Tang Dynasty, due to the appearance of modern poetry, poets deliberately imitated the writing style of ancient poetry in the Han, Wei and Six Dynasties in order to distinguish ancient poetry from new metrical poetry, and restricted it in some aspects, thus forming a fixed pattern of ancient poetry in the Tang Dynasty. As a result, the completely free poetic style before the Tang Dynasty was changed into a semi-free poem between metrical poetry and free poetry.
In short, ancient poetry has a relatively fixed language form and strict prosodic requirements, which makes various forms of ancient poetry catchy and powerful to read. Generally speaking, various forms of ancient poetry have a strong sense of rhythm and rhythm. This sense of rhythm and rhythm are combined with people's thoughts and feelings to form a specific language atmosphere.
Modern poetry doesn't care much, as long as you write the artistic conception, you can do whatever you want.