Getting started with AdSense is simple. After you’ve created an account, add a snippet of code on your pages. Google will then display ads that are either relevant to your site content or of interest to your site user by basing it on their previous searches.
AdSense works on a cost-per-click and revenue-sharing basis. When your site visitors click on the ads, you will get paid. The more traffic your website gets, the more chances the ads will have to get clicked.
In the past, each page was allowed to have only three ad slots for AdSense. Today, there is no limit. However, take into consideration your user’s experience and make sure your page isn’t stuffed with ads.
Here are the different ad sizes you can experiment with on your pages: