Google Adsense is always one of the top sources for money online, from your websites or blog.
Some of you monetize their sites or blogs as a source for extra income, and some makes money online only from monetizing their sites or blogs with pay per click ads, such as Google Adsense which is on the top of the ads networks.
Even more, I know some people who earn online just from Google Adsense, and they build websites specially for Adsense. Here I know that they most concentrate in Top Paying Keywords.
Top Paying Keywords are the keywords that pays more when someone click on it at your adsense, and you get them when your site is about it. You may even get adsense for those keywords if you posted a blog post, or a page on your site with those keywords inside the content (here it’s better if your adsense is in the posts/pages).