In-depth/complete documentation of Grav functionality

Hi everyone,

Is there Grav documentation that contains complete syntax and parameters for Twig functions implemented in Grav?

For example - I’ve been searching for a way to list media of all types on a page. I did eventually find out about query but it wasn’t on

Twig’s own documentation doesn’t seem to have any direct reference for that type of query either.

What methods (other than sifting though the source code) do you employ for navigating through the undocumented functionality of Grav?