When I first started writing, most of my stories came back with form rejections. "We regret that your story does not meet our present needs."
Now that I've sold a few stories, I mostly get written rejection notes. "Thank you for thinking of our magazine. You story is well written, but didn't grab me. Please let us see your next story."
Unfortunately, the written notes, while nicer than the printed form, are really not any more helpful. Can anyone recommend a writers workshop, either live or on line but taught by professional writers or editors?