You can make money online on autopilot but it won't happen overnight and will require hard work in the beginning.
What you could do is write a blog or run a forum on a niche you know a lot about and that is high paying from adsense or other ad networks.
With a blog you will need to write long detailed helpful blog posts that will bring people onto your blog through google search engine.
In the beginning you will need to write lots of content and you will be basically doing this job of writing the content without any wages for at least a few years.
Even after a few years your earnings from adsense or other advertising networks on your blog will be chump change.
If you're looking to make enough money from your blog on autopilot to live off, then expect to wait at least 5 years or more before you can think of quitting your day or night job.
If anyone tells you that you can make money online on autopilot overnight then they're not telling the truth.
It takes years of hard work to get to the point where your blog or other website is earning a living.
All those blogs that state the blogger is earning thousands per month through Adsense or other ways from their blog most likely didn't tell you it took them 5 years or more before they started earning a living from their website.