Starting an online course is one of the best and easiest ways to make passive income. Here are 10 examples of ideas you can use when creating an online course or ebook as a source of passive income:

1. A course on how to start a successful blog or YouTube channel
2. An ebook on how to plan and execute a successful home renovation project
3. A course on how to create and sell products on Etsy
4. An ebook on how to start and grow a successful online business
5. A course on how to use Photoshop or Illustrator for graphic design
6. An ebook on how to train for and complete a marathon
7. A course on how to play the guitar or another musical instrument
8. An ebook on how to plan and execute a successful event or party
9. A course on how to create and sell digital products, like printables or stock photos
10. An ebook on how to master a new language or improve language skills.