From Shopify Wiki

The liquid variable blog has the following attributes:

blog.id

Returns the id of this blog.

blog.handle

This is the accessor for this blog. It is usually the blog's title in underscore with every blank space replaced by a hyphen. "My New Blog" would thus have the handle "my-new-blog".

blog.title

Returns the title of this blog shopify

blog.articles

Returns a collection of all of this blog's articles that match the current paginate options.

blogs[blog.handle].articles

Returns a collection of all of this blog's articles regardless of pagination when the blog.liquid template is rendered. Use this construct to get the most recent blog articles to show e.g. in a sidebar in blog.liquid.

<h3>Recent Posts</h3>
<ul>
{% for article in blogs[blog.handle].articles limit: 5 %}
  <li>{{ article.title | link_to: article.url }}</li>
{% endfor %}
</ul>

blog.articles_count

Returns the count of all of this blog's articles that match the current paginate options.

blog.all_articles

Returns a collection of all of this blog's articles (ignoring pagination).

blog.all_articles_count

Returns the count of all of this blog's articles (ignoring pagination).

blog.url

Returns the relative URL of the blog. See also shop.url.

blog.comments_enabled?

Returns true if comments are enabled for this blog, false otherwise.

blog.previous_article

To use in article.liquid.

URL of the previous (older) post.

It is false when used in a conditional when there is no previous article.

blog.next_article

To use in article.liquid.

URL of the next (newer) post.

It is false when used in a conditional when there is no next article.

Some code with ugly inline styles to drop fully-baked in your article.liquid template:

<div>
  {% if blog.next_article %}
  {% capture next_url %}{{ blog.next_article }}#content{% endcapture %}
  <span class="left" style="float:left">{{ '← Next Post' | link_to: next_url }}</span>
  {% endif %}    
  {% if blog.previous_article %}
  {% capture prev_url %}{{ blog.previous_article }}#content{% endcapture %}
  <span class="right" style="float:right">{{ 'Previous Post →' | link_to: prev_url }}</span>
  {% endif %}
</div>