I have a note to add for new writers, and to some, it may be a doozy.
Please don't post your first draft! It sounds alarmingly simple, but really, it happens remarkably frequently. I don't have as much experience with this site yet as many do so I cannot speak to any statistics and whatnot, but I can say that this happens with regularity on any given writing site I've ever visited.
Obviously, spell check goes without saying, but this is more than that. This is about taking a scene that you suddenly wrote due to your inspiration and turning it into a story BEFORE showing it to the internet community. Even more troubling is when a writer takes the time to set up a sequence of scenes into a interesting story arch but does not take the time to edit it and/or seek peer review before essentially publishing it as original work.
Usually, there is a place on a writing forum for peer review and it is a wonderful thing to have for posting excerpts of your work for others to see. You can take the advice and criticism you receive to improve your work and then post it for us to see. Really, these steps don't "Harm" creativity or "stifle" enthusiasm, they are simply common tasks to complete before posting a story. There will ALWAYS be room for improvement, but if you at least put forth a little preemptive effort, your work will be received much better.