Blogging
One of the main reasons why people don’t blog is because they don’t think anyone cares what they write. This is a mistake because there are unlimited opportunities on the Internet. Similarly to podcasting, it’s all about finding the right format and staying consistent. Then it can become one of the best sides hustles out there.

People blog about everything from the NFL Draft to ancient Roman siege techniques. It can also be a very cathartic experience because bloggers pour their hearts onto the page. This can be a great way to remain passionate about something when a full-time job is stressful (via The Guardian).