UP

You can access a snippet of a posts’s content by using excerpt variable on a post.

By default this is the first paragraph of content in the post,
however it can be customized by setting a excerpt_separator variable in front matter or _config.yml.

---
excerpt_separator: <!--more-->
---

Excerpt with multiple paragraphs

Here's another paragraph in the excerpt.
<!--more-->
Out-of-excerpt

Here’s an example of outputting a list of blog posts with an excerpt:

<ul>
  {% for post in site.posts %}
    <li>
      <a href="{{ post.url }}">{{ post.title }}</a>
      {{ post.excerpt }}
    </li>
  {% endfor %}
</ul>