A landing page minimizes options and focuses attention on your call to action (CTA). Studies show that focused landing pages increase customer conversion rates.
A landing page is a single web page, that removes all distractions (links) and only provides one call to action (CTA) button and maybe a "no thanks" that leads to an secondary CTA.
Imagine walking into a physical store and having a representative from every department meet you as you walk in the door. They all have a sign with their department title and a brochure for you. This is similar to what happens when potential customers visit your website with a lot of other page links. When they see all the available pages their subconscious mind starts to think about all the other stuff to see.
If you are paying for advertising and targeting people who are looking for products or services like yours, they are already prequalified leads, consider sending them to a focused landing page, not your website.
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The primary offer of the landing page could be to only sell a consulting or coaching service for a year. The landing page provides initial interest, emotional appeal, and logical appeal, then two calls to action, 'buy now' or 'no thanks.' The 'no thanks' button connects them to a different landing page that gives a pitch to try consulting or coaching for three months, or an online personal development course from a strategic partner that gives you a commission. You could also add a landing page to purchase a planner or your book on Amazon or Barnes & Noble.
The primary offer of the landing page could be to just sell an annual membership. The landing page provides interest, emotional appeal, logical appeal, then two calls to action, 'buy now' or 'no thanks'. The 'no thanks' button connects them to a different landing page that gives a pitch to try a monthly membership. You could also connect other landing pages for other offers like a personal training plan or supplements. Or you could offer a service from a partner like a chiropractor or bike tours that give you a commission from each sale.
Consider Google search advertising, where the people clicking on your ads are already qualified because they just searched for "insurance agent" _____ (name of your city). They are sent to your service focused landing page (not your website with dozens of pages to browse) where you provide an emotional appeal, like how it feels to have the peace of mind after setting a policy in place. Then some logical appeal like features of the organization, the process of working with you or other credibility or authority comments. Then the call to action, and they only have two choices, contact you or leave the page. No distractions. Proven to increase conversion rates.
You should especially consider using landing pages if you are doing any paid advertising. Focused landing pages are proven to convert more customers. Every extra customer conversion counts.