23. Tutoring

In addition to public speaking, another side business that enables you to share your knowledge is tutoring. It’s not only a great way to earn some money on the side, but it can also be enormously satisfying!

People of all ages need help with subjects like mathematics, science, reading, foreign languages and more – so if you’re skilled in a particular subject, helping others to succeed is a great way to earn some extra cash. All you need to do is put up flyers at local schools and libraries, as well as advertise on Craigslist – and, once you start, you’ll get additional business via referrals (assuming you do a good job, which we’re sure you will!).