How to make posts (categories) different in design from the main page in Wordpress?

Question

WordPress

Good afternoon!
I made a Landing Paid for a client and decided to put it on WordPress for the convenience of changing h2, h3, etc. Later, I realized that the landing could not be pulled on the VP. But now, you need to expand the "functionality" of the site a little and add articles. But make them in the appropriate Landing style.
The main page should link to articles, but when you go to the article, the design will change. Heard something about statistics pages, but it is very important that the article on this page has breadcrumbs. And the essence of the question: how to implement? The article can be adjusted, thank you in advance.
Here is an example. You can just go to the site to understand what I mean.
Home:
Article:

Answer 1

https://codex.wordpress.org/

Answer 2

I would do this:
1) Create a custom post type "Articles". Plugin PODS
2) Add some articles for the test
3) Make a query_post on the page. Display our custom articles in a convenient way
4) The new template (where there will be breadcrumbs and the full text of the article) is called single.php
In it, display standard breadcrumbs and output
PROFIT records in a standard loop!