Write Shop - WriteShop is designed to teach composition skills to junior high and high schoolers in a step-by-step manner.
https://writeshop.com/
Writing World - A writing site with a series of articles designed to take a writer from "How do I start?" to a publishable manuscript.
https://www.writing-world.com
Writing.Com - Writing.Com is an online community for writers and readers of all interests and skill levels.
https://www.writing.com/