For example, writing a book is a passive income stream. You write it once and sell it over and over. The word passive is a little deceptive because you need to market the book. Nevertheless, compared to non-passive sources of income, which you need to do over and over to make money, such as providing a service, passive income streams require less time once they’re created. Other forms of passive income include other written works (i.e., courses), audio or video creations, affiliate marketing, licensing your idea, franchising, or continuity programs (i.e., memberships).
There’s a second downside to this model. Although I’ve done advertising and sponsorships in the past, and have made hundreds of thousands of dollars doing so, the truth is it takes a lot of time for this business model to start to generate income for you, because you need to build that audience first. In addition, what happens when you build your audience on a platform that ends up changing its algorithm, affecting how often you actually get seen by the audience you’ve built?
Peer-to-Peer Lending: Earn up to 10% in returns by lending individuals, organizations and small companies who don't qualify for traditional financing through peer-to-peer lending platforms like Lending Club. You can lend $100, $1,000, or more to borrowers who meet lending platform financial standards. Like a bank, you'll earn interest on the loan - often at higher returns than banks usually get.
Portfolio income can come from multiple sources – interest/bond coupons, stock dividends, financial strategies including derivatives and capital growth.  Each offers some cash flow and some also offer potential capital gain with some risk from liquidity and volatile prices.  In this low-yield environment, many investors rely too heavily on cash flows and to pursue this are venturing further into riskier areas than they’d normally consider.