When you start writing poetry, you don't have to give yourself too many constraints, as long as the sentences are fluent and you can clearly express your meaning. The most natural sentences, even simple and even vulgar, will certainly make people feel happy.
After that, I began to pay attention to refining words. Pay attention to all the details and carefully examine whether the image of a single word is consistent with what you want to write. Many times, it is often the incisiveness of one sentence that makes the whole poem a classic. Here I suggest you read Mr. Zhu Guangqian's "Talking about Words" and you will gain something.
Later, I began to pay more attention. Rhetorical devices of image use: metaphor, metonymy, exaggeration, duality, parallelism, rhetorical questions, and combination of reality and reality. Means of expression: using classic associative imagination to contrast and render symbols, suppressing the contrast before and after, taking into account the combination of motion and static, combining positive and negative aspects, expressing the mind, ambition and feelings through the scenery. These are not necessarily used in a poem, but you should learn to choose the right way to write what you want to write.
A lot has been said, but it is estimated that there are not many useful words. In short, things written by people who love life will be beautiful. Reading other people's beautiful poems, one's soul will unconsciously sublimate while feeling beauty, and the ability to write poems will also be improved a lot.
I like the poems of Shu Ting and Xi Murong very much. I recommend them to you when you have time ~