There are some ways you can generate passive income online and all these things will depend on you and your interest . Some passive income online we will need a good tools like a laptop to be able to start .
Based on my understanding of passive income, I believe you can make money passively by engaging in the following online business.
1) Content writing : This is one of the best way of generating passive income, there different ways to make money as a writer. You can choose to make money as a writer by writing of content and formatting it as an eBook and sale it on Amazon Kindles, as long as your content is of high quality and your niche is really attractive you will always make money from your ebook.
2) Having a YouTube channel is also another way you can generate a passive income , but now adays it is not every one that really have the interest to make money as a YouTuber . If you really have the passion to start a YouTube channel you can make money passively with good quality contents .
You only have to choose a niche that really attracts people and focus.