⥂ ~moon@muratso, in summary, #hashtags are social channels, [[roam tags]] are for personal notes... and if you click "create a subchannel" up top you'll see options for private channels and such
⥂ ~moon@muratthansk @David!! square bracket tags are for your own personal notes.
social tagging is done with #hashtags instead (or if you want to nest deeper from your current context, you can use >nesting tags)