More than 50% of the overall success of an online advertising campaign comes from the landing page used for the promotion. To put it more specifically, success/failure depends on how optimized the landing page is.
Mastering online advertising takes years, and above all, hundreds if not thousands of campaigns. Launching an online campaign is a team job, and it requires constant communication. From finding a creative concept to designing banner ads and then setting up a landing page, all the elements must be in-line with the main idea and objective.