Find work. When you first start out, you may have to accept work writing about a topic you don’t find all that interesting. You must keep an open mind and be willing to accept work that may not be in your desired field. However, as you continue to write, you not only learn about more topics, but you also build your reputation. With time, you can be choosier about assignments you want to accept.
They're also far more popular than you might think. "Online courses are huge right now," says David Hoos, Head of Marketing at The Good marketing agency. "They can be incredibly helpful to develop niche skills and businesses will often use them for professional development purposes. If you have a unique skill that you can organize and share, a course is a great way to do it!"