ognigiorno

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PostSummary allow you to add a widget with a kind of preview of your posts. You can add a list like the newspaper sites 
or a list of posts really similar to adsense style. You can mix your posts and adsense with the same aspect. 
Every instance of the widget is independent and can be configured separately. 
You can choose the categories to be displayed or if the lias is made of the most recent posts or, if you have statpresscn plugin, 
the most read posts.

PostSummary

Postsummary creates a widget that contains a list of posts with title and the beginning of the text. You can style and add a thumbnail.

Denis Žoljom

The plugin will provide a collapsible HTML <code><details></code> block with a <code><summary></code> element that will be shown when the element is collapsed. Inside the details you can put as many paragraphs or code blocks as you want.
<h4>Requirements</h4>
<ul>
<li>PHP 5.6 or greater (recommended: PHP 7 or greater)</li>
<li>WordPress 5.0 or above (because of the Gutenberg editor)</li>
</ul>

Details Summary Block

This plugin provides a simple block for the `` HTML element.

PostSummary vs Details Summary Block