You want your poetry to be a reflection of who you are. You want people to take it seriously. You want it to be as perfect as can be, right? If so, the biggest thing you can do is take time to read through it before making it public. Make sure the words are arranged in a way that makes sense. Make sure you take the time to proofread what you have crafted. A sloppy poem will be overlooked by your readers.
You will find some examples of common mistakes that have been seen in people's work. Some may be an innocent oversight on the author's part. Others might be a reflection of a sloppy author. Either way, learn from these so you don't make the same mistakes.
Articles on Developing Poems
Poetry takes words, memories, feelings and perspectives and transforms them into an art form. If you have an interest in writing poetry, but aren't sure where to start, remember that much can be learned from reading poetry written by famous poets. Besides reading as much poetry as possible, there are also quite a few poetic techniques you should know to write poems that allow you to express yourself in an artful way. Studying said techniques will help you to make the leap between poetry student and poet.