I was having problems getting a list of Jekyll blog posts that had a specific property declared in the YAML front matter (a simple featured: true) and limiting the list. If you do what I did at first:

Copy    {% for post in site.posts limit:1 %}
       {% if post.featured == true %}

         {{ post.title }}

       {% endif %}
    {% endfor %}

It will only work if the first post is a featured post, but not if the second post or after is the featured post. That's because the list is limited before it's filtered. Additionally, the {% if %} does not allow limit:1.

I racked my brain and the resources of the Internet with many possible approaches that I won't bore you with, but thanks to this very helpful comment I was able to build this out that worked great:

Copy    // Emulates `limit:1`
    {% for post in site.posts %}
        {% if post.featured == true %}
          {% capture count %}{{ count | plus: '1' }}{% endcapture %}
          {% if count == '1' %}

            {{ post.title }} 

          {% endif %}
      {% endif %}
    {% endfor %}

    // Emulates `limit:2 offset:1`
    {% for post in site.posts %}
      {% if post.featured == true %}
        {% capture counttwo %}{{ counttwo | plus: '1' }}{% endcapture %}
        {% if counttwo == '2' or counttwo == '3' %}

          {{ post.title }}

        {% endif %}
      {% endif %}
    {% endfor %}

PS I can't even find documentation where I normally look for {{ count }}.