Hold on, what are landing pages exactly?
Landing pages are the first pages your visitors see after clicking on a link you posted somewhere, which could be your home page, but for a better, quicker and more productive costumer experience, it should be a specific page talking about a specific subject.
The easiest examples for correctly linked landing pages are e-commerce websites who create ads on various other locations, like search engines, for example.
Let’s say your store is having a -50% off sale on an awesome product. Now, you’re gonna want to let people know about this offer, so you will create an ad on Google ads, for example, which will talk about said offer. The ad, which could include something in the lines of
“Fed up with expensive and sad products? Click here to check out our -50% sale on our amazingly awesome product!”.
If someone should click on this ad and be redirected to your home page, this will not be bad per se, but it would be much better to bring them directly to an ad-hoc page that talks about the sale, shows a few product images and sports a large and attractive CTA to claim the offer.