Did you know that it is impossible to copyright an idea? You can copyright creative works and the entire paragraph you are reading now can be copyrighted, but I can't copyright my subject or the idea I came up with to discuss this subject with you. You can also write about it if you wish.
And this is the point: Frequently, it is not content that you are looking for. Instead it is an idea. Once you have the idea, then writing about it is fairly easy. The idea however must exist.
You can stare at a blank page, and not know what to write about. If you have ever experienced this phenomenon, it is not the lack of an article and text you face. It is an idea. Once you have the idea, everything starts moving forward. So you need ideas to write about. To get ideas, visit firstgov.gov and search any word. See what comes up. Then ideas will begin to pop into your mind. For really good brainstorming instruction, purchase the book: The Writer's Idea Book by Jack Heffron