It is a little difficult to work here and it takes a long time to earn money from Google Adsense.
Millions of website owners around the world are earning thousands to millions of dollars a month with their sites. You need to have a website to earn money from Google AdSense (of course anyone can create their own website now) and some way to bring traffic or visitors to the website then you can earn money from Google AdSense and other advertising networks.
This is the most sustainable way of passive income online. If you have a blog site or website rich in good content, your online income will continue. A few days ago, Google AdSense was not approved on Bangla websites or blogs. But since last year, Google has added Bangla language to their AdSense list, anyone can earn money through his Bangla website or blog. You can also earn income by adding ads to your site through other advertising networks such as bidvertiser, infolinks etc.
Nice post