Passive income ideas

Hello everyone how are you all doing.
Its a great forum and whats really good about it is that people are actually willing to help and share knowledge.
As the title pretty much explains my question i am looking for ideas that worked or working for you for passive income.
It will not only help me but i believe it would be helpful to everyone here. Thank you.

lets invest in food chain business like Subway mcDonald pizza hut

it seems like much of a full time business idea.