Thank you for your question. The preview of a post in Wordpress is called different things depending where it is setup, they are:
excerpt, teaser, or summary
How it is setup depends on the specific theme you are using, but here is a link to Wordpress' official guide on "How do I show an excerpt, teaser, or summary, for an article on the site homepage?"
If you have any further questions, feel free to post them below.
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