The Writing Process for New Lawyers: Getting it Written and Right, by Gerald Lebovits, The Legal Writer, 89 N.Y. St. B.J. 80 (May 2017) (with hat tip to William P. Statsky)
Although this article is about the basics of legal writing, even seasoned legal writers will find it useful and instructive. Regardless of how well we think we write, we can always improve.
This article puts an emphasis on focusing on the purpose of your document, organizing your thoughts, considering your reader, researching, and editing. In short, all the basics you need to write well. -CCE