Ancient poetry is divided into ancient poetry and modern poetry. Classical poetry is not demanding, but generally requires words and rhymes; Modern poetry is the so-called metrical poetry, which has strict requirements in terms of words, adhesion, rhyme and balance. Needless to say, the number of words, rhyme can refer to the flat rhyme (remember it is flat rhyme); Sticking is adhesion and confrontation; In terms of training, metrical poems have a prescribed format, so it is better for beginners to fill in according to scores. As for the difficulty that non-beginners can master, it needs to be gradual. Metric poems are divided into quatrains and metrical poems, including four quatrains, two or four rhymes, and whether the first sentence rhymes or not; Even sentences in a metrical poem rhyme, whether the first sentence rhymes or not, the third and fourth sentences are antithetical, and the fifth and sixth sentences are antithetical.
For words, each epigraph has a designated word spectrum, so it is enough to fill words according to the word spectrum, so writing words is also called filling words. You can look it up in the dictionary or read the Book of Songs by King James.
It is best to study classical poetry under the guidance of teachers. Wang Li's Poetic Metrics is quite authoritative, and of course other books on poetic metrics can also be consulted.