You will find as many diverse answers to this question as you can find answers. I did not study to learn to write poetry, I simply read poetry a lot. Most are familiar with the fact that my father taught me to read before I started school with a book of Robert Louis Stevenson's poetry. You can imagine my teacher's shock when as a first grader(no kindergarten back then), I stood up and recited "The Land of Counterpane" from that book, and that I was totally bored trying to read:
See Dick.
See Jane.
See Dick run.
See Jane run.
Run Dick, run.
Run Jane, run.
Anyways, I digress. Without the early exposure to poetry, I would not have ever tried to write it. To write poetry does take a bit of knowing what you are doing, but it also takes a talent for putting words together in a manner that makes it poetry and not just a journal. If you want to write greeting card poetry. that just takes a talent for rhythm and rhyme, but to write poetry for poets, it also takes education to keep from looking like an idiot. You should know what words mean and how to use them. I have written my own share of garbage, as have most poets or writers of any words, but occasionally I write something I like. With more education on the subject of poetry, maybe I could develop my 'craft'.