Learning about DFRNT is closely connected to leveraging the open source TerminusDB data product engine, for which DFRNT is a UI and hosting provider.
TerminusDB Data Products is a data distribution format similar to the git code repository model. You can save an offline copy and you can both clone, fetch, pull and push updates between instances of a data product living in multiple places.
The Data Model used in DFRNT data products is well described in the TerminusDB documentation. DFRNT builds ease of use and additional capabilities on top of the base data storage format and service provided by TerminusDB open source.
There are many sources of knowledge to learn DFRNT, some of them here: