Adsense Tips

Medium to large rectangles outperform other ad types.
Try to blend your ads into your website if possible because it increases CTR.
Horizontal ads can be successful if strategically placed.
Remove low earning pages and focus on high-earning pages for the highest eCPM.
It helps to minimize AdSense on sites that have a lot of affiliate links.
Put appropriate keywords around AdSense ads.
Understand heatmaps of your site and place your ads in suitable locations.