Writing-World.com is my first place to go when I want to learn about different kinds of writing, especially if it’s an unusual niche like greeting cards or quizzes. They also have extensive articles on the business aspects of being a writer.
The website is broken down into sections such as Beginner’s World, Commercial Corner, International Writing, Children’s Writing, Creative Nonfiction, etc., and each section is broken into subsections for easy perusal. Sometimes I like to visit the site and poke around randomly to see what catches my eye.
Writing-World.com is also handy as a brainstorming tool if you need to come up with new ways to bring in income as a writer, because so many different types of writing are covered.