title: What language is in ".liquid" files?
body: <p>I got some a small assignment to add a feature to a theme made on Shopify. I am good with PHP but shopify uses .liquid files.
  I want to know how it works like this code snippet </p>
  
  <pre><code>{{% if payment.gateway | name %}}
  </code></pre>
  
  <p>Though they have given the documentation but I want to know how I can work on this language as I don`t have shopify paid version and I want to try this before paying for it.
  Can anyone help me</p>