These metrics give you a high-level overview of how your subscribers are interacting with your campaigns and allow you to compare the success of one campaign to another. If you want to go deeper and see the exact people who opened and clicked your campaign, what links they clicked, etc. you can do so by choosing some of the other reports from the right hand side menu.
If links and looks are set, begin interacting with the page. Abandon it, adjust the window size, convert. Are error messages appearing when they’re supposed to (if, for example, you don’t input all the form’s required info)? Is your CTA button working? If you abandon the page, are you retargeted with ads? When you resize the window, does your landing page respond accordingly?