Hi @Itsben,
Do you mean an external link that will open supernotes and filter by a certain tag? Such as supernotes://?tag=definition. This doesn’t exist currently.
Or are you more looking for Inline tags, which you can click similarly to tags on the bottom of a card to filter by a certain tag?
Custom collections will have urls that you can use to link to them externally outside of Supernotes. Such as my.supernotes.app/v/collection/tasks. I hope that helps!