Children's songs are not poems, nursery rhymes are poems, and they are short poems handed down to children orally.
Ls is also generally correct, including ancient poems, modern poems and so on.
Lz, if there is a requirement to write poetry, it is recommended to write modern poetry. There are not so many rhythm requirements. Use some good rhetoric to grasp the central emotion or what you want to express, and it is best to light it up a little (such as using strange and wonderful words), which will be excellent!