13: Write and Sell a Book or eBook

A book, or particularly an e-book, is another example of selling a product or a digital product. Much like an online course, your book can be about any topic in which you have expertise. And just as is the case with an online course, you can sell them using affiliate arrangements through multiple websites and blogs.

Once you create an e-book, it generates another source of passive income. The orders and income come from the sites where your e-book is being promoted, and the money is deposited into your bank account. There’s nothing more you need to do after creating your book. It can even generate revenue for years.