If you are good at Mobile app development, or perhaps you are an experienced welder, you can create educational videos and articles, and even teach a whole class by signing up to websites that offer such services. Making an online course is no easy task, however quality content and a little effort can make your course several hundred dollars worth, so it might be a good idea to consider.
Wouldn’t it be nice to earn money while not working? That money is called residual, or recurring, income. It's what can happen after you put a lot of time, effort and sometimes money into a job to continue to get paid for the work months or years after it's done. (Salary jobs are part of linear income. This income is directly related to the number of hours you work. If you work 40 hours, you get paid for 40 hours of work.) Once you set up your business to earn residual income, you continue to make money while doing other things – maybe even starting a new business to generate more residual income!
“Let me remind you again that when you put a book out there, you are a published author in a space where you are an expert. Your book becomes the ultimate business card, not to mention a source of ongoing revenue. Did someone say “ongoing revenue?”. Who does not need to make some extra money on a regular basis? Realize that this book will take some work to complete once, but thereafter it exists forever – working to bring you royalty checks five, ten, twenty years from now. Money will be consistently flowing into your bank account. If you write a good book that provides real value, then you realistically have a revenue stream which will bring income for decades to come.”