I found this to be an excellent article for beginning poets to read for items to avoid in poetry. Basically a colorful presentation to what we've all seen as bad poetry, and what new poets need to be watching out for. Written by Ezra Pound, and he certainly knows what he's talking about when it comes to poetry. Entertaining and informative.
"A Few Don'ts by an Imagiste"
Poetry "don'ts" article by Ezra Pound