Hello,
Bookmarks is the feature being developed right now, so there are no official docs/tutorials yet. Bookmarks allow you to save specific locations in Checkvist and navigate to these locations easily. Such locations include:
- lists
- list items
- saved global searches
- filtered lists
- filtered due page
- focused and filtered lists
When saving a bookmark, you give it a name and, optionally, a keyboard shortcut in a form bN where N is a number.
To set a bookmark on a filter/search - use the bookmark sign in the search field (it appears when the filter is present). To set a bookmark on a list item or list - use ab keyboard shortcut. When there is no selection - a bookmark to a list will be created. When a list item is selected - a bookmark on the list item will be created.
To navigate to a bookmark, use bb shortcut to open “Bookmarks” chooser and navigate with Enter key. Or, use a bookmark keyboard shortcut assigned when bookmark was created.
I hope this gives a bit of overview of what’s cooking 
Kind regards,
KIR