3. Did you read the Submission Guidelines?
Each article directory has a different culture. Glance through the Submission Guidelines before setting up an account to make sure your article will be welcome before you submit it. If an article directory is based around a niche like gardening, then please resist the urge to submit your Mesothelioma articles. There are plenty of article directories that want your articles. It’s not an effective use of your time to submit unwanted articles to a niche site.
4. Is your article PG-rated?
Don't submit sex-related articles, profanity, or general nastiness. Article directories are businesses and, therefore, exist to make money. This means they generally receive income through affiliate sales or advertising. So, if your article includes sex or contains words stronger than "darn", don't be surprised if your article is rejected. Of course, if your article contains nastiness or anything illegal -- don't even bother.
5. Is your Article original and written by you?
Submit only original articles. Please do not copy someone else's article, edit it, and submit it. That's stealing and you will be caught. And, do not submit articles from shared content sites. Article directories want original, unique content. Public domain is 'public' but think how ineffective article directories would become if there were 500 versions of the same public domain piece. Instead of wasting your time figuring out how to reinvent other people's content, just write your own.
Now that you know what not to do, start writing the kind of articles that article directories dream of -- and watch your business grow.