There are thousands of niches that you can choose from when it comes to a side business. For instance, you can do a freelance project related to your current career, or you can start an eCommerce or dropshipping business from your home.
I’m not saying that it will be with a click of a button as there is lots of learning and skills included in this path. However, it won’t take you years of learning compared to other “normal day” careers. This is because side businesses usually tackle one specialty and it usually doesn’t take too long to get a grasp that allows you to start making income.
One important question is what problem do you want to solve, why, and how can you do it? For example, did you search for something in your area and never found it? Are people in need of that particular object? If so, then why not start providing it for people in your region with a website? Maybe you’re passionate about teaching English, then why not start doing it on websites that provide live in-person English lessons?