Google AdSense is still one of the easiest ways to start earning money online. Your whole business plan should not revolve around it. At the same time, you could earn a decent chunk of money every month from this program. In order to maximize your earnings, you should think about testing ads in different positions. Many folks have had success with in-post ads. The AdSense In-Post Ads can help in that regard. It allows you to insert ads into your posts more easily.
The AdSense In-Post Ads plugin allows you to add AdSense codes to your posts quickly. It creates shortcodes you can use on any page. Keep in mind that there is no guarantee you are going to earn more money by putting your ads inside your posts. But you should test it to find out for sure. This is a free plugin.