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Is your home page a landing page? You shouldn't consider it one. Your ad entices people to click for more information, while your landing page closes the sale. It shouldn't invite people to surf your Web site. It's a stand-alone page that hides your main Web site navigation. It offers few or no options other than taking the intended action. And the copy should expand upon the message revealed in the advertisement visitors clicked on. Keep in mind that different ads require different landing pages; each landing page should be customized for a particular audience.
Some great info here on changing up descriptions and the page itself to increase sales.
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