Passive income is never truly passive. You have to at least provide some value to others in order to make some money from them. This means you have to do something to create that value.
The most passive form of income is probably achieved by creating something (of value) once that can be recreated easily. Good examples are eBooks, blog posts and articles, music, etc. That's how some artists get rich: they create something once and sell it over and over again.
Look at what kind of things you can create once. After you've done that, you can extract value from it.
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