PageCMS is a front end developer's tool to create dynamic content websites fast and easily.
The process goes as so:
PageCMS is broken primarily into two components elements and pages.
Pages are containers that contain elements, each element stores the data and can be many different data types.
Pages also define the URLs of the website.
A good reference for the templates is the Django template reference
Django's template uses a very similar language as Liquid, if you've used Shopify before it's very similar to that.