How to do sideline business?

For example, if you want to do a sideline, I suggest you learn some skills first. For example, you can choose a bride and make-up, or you can study manicure and eyelashes and do a sideline or main business. If you want to study, I suggest that you can find a professional and formal school to study, and it is convenient to finish it. You can work independently or open a shop part-time.