Certain posts that you create can work like passive income for you.  For example, if you have display advertising on your blog, then this is purely passive income, though you do need to keep creating content for returning visitors and subscribers.  It takes a long time before you can monetize a blog, at least 6 months.  This is why a lot of people drop out of blogging before 6 months, because it is a lot of hard work.

passive income definition

Build a list in a particular niche and tell them stories. Create a bond. Build a relationship with them. It's important. Then, when you've created a bit of culture, start marketing affiliate products or services to them that you think they might like. Just be sure that you personally vet out whatever it is that you're selling to avoid complaints if the product or service falls short.
The United States Internal Revenue Service categorizes income as active income, passive income, or portfolio income.[1] It defines passive income as only coming from two sources, or "passive activities": rental activity or "trade or business activities in which you do not materially participate."[2][3] Other financial and government institutions also recognize it as an income obtained as a result of capital growth or in relation to negative gearing. Passive income is usually taxable.

What means passive income?