One of the devs here - totally true, our help docs and landing page don't really show half of what you can do. Help docs have a lot if you dig around though.

Heres a link

https://roamresearch.com/#/v8/help/page/1wnq-ZAAN

Really appreciate users like pps who do the work of figuring out how to make Roam work for them at this early stage.