Backlinks to this can server as a basic index
A marker for exporter to make a given page public
Public marker is the tag you use to mark page as public (make-public by default).
You can use make-public page's backlinks section as an index - every page in the garden has a link to it.
This garden and my main garden (at https://vlad.roam.garden/) are based on the same database for example. This garden is using Help Garden as a marker and main garden is using make-public