Hello,
These are key points to consider while writing articles:

* Articles should be original and information rich.
* Articles should be keyword rich but not excessive to the point of keyword stuffing.
* The average length of articles should be between 500 and 700.
* Give a unique title to your article with main keyword into it so as to make it easy for web crawlers to identify and classify the topic of your article.
* Giving subheadings, bullets and numberings to articles make it presentable and easy to read for potential customers.

Article submission has appeared as the strongest tool for seo.a well written unique article can get you good rankings in less time.