When designing pages where you want users to take a specific action, the position of the CTA is a crucial element to consider. This article is a bit heavy on jargon, but the screenshots help illustrate the author’s point, which is that users are far more likely to click on CTAs in the bottom, right-hand corner of the screen.
While you should clearly test the wording of the CTA and the color, size, and shape of the button, don’t forget to test its position on the page. The primary CTA should be obvious to the user – and above the fold, please! One free and easy check is to squint your eyes so the images and text blur. Does the CTA stand out?
Side note: For what it’s worth, I think the author overestimates how much of the page text users read. I’ve conducted landing page tests where every word was changed while all design elements remained constant. There was no discernible difference in click throughs.