Invest in dividend-paying stocks
Buy and rent out real estate
Use peer-to-peer lending platforms
Create and sell digital products
Build an online course
Start a blog with affiliate marketing
Monetize a YouTube channel
License photography, music, or artwork
Create an app or software subscription
Invest in index funds
Rent out unused assets
Write and sell an ebook
Build a dropshipping store
Create a membership site
Earn royalties from creative work