A landing page is a web page that you send a visitor to to convince them to buy a product you are selling. Typically you use a landing page when the offer you are promoting requires a credit card for the user.
Some landing page tips:
1. Make your landing page clean and clear of advertisments or adsense
2. Always include a clear call to action
3. Always ensure the link to the offer is above the fold
4. Include images that are cut off by the fold so that visitors will instinctively scroll down
5. Ensure the page loads quickly. People will hit the back button if it takes too long to load.