Invest in dividend-paying stocks
Buy rental property
Invest in index funds
Create and sell digital products
Write and publish an ebook
Build an online course
Start a blog with affiliate links
Create a YouTube channel with ad revenue
License photos, music, or artwork
Develop a mobile app
Rent out unused space
Peer-to-peer lending
Buy and hold REITs
Sell print-on-demand products
Build a subscription newsletter
Create a membership site
Earn royalties from creative work
Automate an e-commerce store
Invest in bonds or CDs
Buy existing cash-flow businesses