Most passive income options

[Monica C.]

What are the most passive passive income options? I'm wondering what are people's favorite passive income options and how that's been working out! 

My passive choices so far have been investing in syndications or lending money privately to flippers. Both required some work upfront to find people to trust and research their projects. But once the investments began, I felt I had little control and had to trust my investments were safe, so even a worry wart like me had to learn to let go a little and let others do their job. So far things have worked out for me and I guess the risk/time/effort vs returns is a question I constantly re-evaluate-- less passive and more control/more time/energy doesn't always result in higher returns ultimately, so trying to find balance. 

Would love to have others share their experiences with passive options!