The collection tag is denoted by
{% collection %}

A collection tag is used to pull data to be displayed on a page from the content section of a site.

These are the valid collections:
blogs,products,videos,landings,pictures,audio,videos,pages,testimonials,locations

There are a number of options when using a collection tag, they are:

name - this tells mms the variable name you want to reference the collection as while you are doing your templating eg.
{% collection blogs, name: featured_blogs %}

tag - this tells mms to filter by posts only with this specific tag, eg.
{% collection products, tag: special %}
{% for product in products.entries %}
  {{product.title}}
{% endfor %}

{% collection users, limit: 4 %}
{% for user in users.entries %}
  Hi! {{user.first_name}} {{user.last_name}}
  {{user.tags}} : {{ user.tags | contains: 'tag' }}
  {% assign random_tag = user.tags | random %}
  {{random_tag}}
{% endfor %}


order - this tells mms the order in which the posts should be ordered, eg.
{% collection landings, order: inserted_at desc %}

limit - this tells mms how many posts you want, eg.
{% collection pages, limit: 5 %}

override_page - this tells mms that you'd like to use the page_size parameter from the url of the page instead of a hard limit set in liquid, eg.
{% collection pictures, override_page: true %}

starred - this tells mms to only get posts that have been favourited, eg.
{% collection blogs, starred: true %}

user_sub - this tells mms to only get posts that have been submitted by users, eg.
{% collection blogs, user_sub: true %}

label - this tells mms to only get posts that have a specific label, eg.
{% collection blogs, label: tech %}

status - this tells mms to only get posts with a specific status, eg.
{% collection blogs, status: Draft %}

starred - this tells mms to only get posts that have been favourited, eg.
{% collection blogs, starred: true %}

user - this tells mms to only get posts that have been made by a specific user, eg. (where the users id is 230)
{% collection blogs, user: 230 %}