You can check all the available shortcodes, you can use for free in your web site, in the following pages:
Basic components for Grav CMS
A comprehensive list of all the basic components, you can use for free as shortcodes in your website.
Bootstrap components as shortcodes
Gravstrap plugin implements all Bootstrap components you can add to any page, using powerful shortcodes syntax: watch them in action in this page.
Gravstrap plugin implements several modules you can use as shortcodes to simplify the web site building: watch them in action down in this page.
Render components by templates
You can use the available components rendering them by their templates when you need to represent dynamic data fetched from an external source, like a database or a json file.