Content is a great way to guide users to a landing page. Typically, you create content to provide visitors with useful, free information. You can include CTAs anywhere in your content — inline, bottom-of-post, in the hero, or even on the side panel. The more delighted a visitor is with your content, the more likely they are to click your call-to-action and move onto your landing page.
Marketing emails need to be personalized to the reader and filled with interesting graphics. Few people want to read emails that are addressed "Dear Sir/Madam" -- as opposed to their first or last name -- and even fewer people want to read an email that simply gives them a wall of text. Visuals help your recipients quickly understand what the point of the email is.

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?