Hi Don Dz I am aware of the Table of Contents feature, but sometimes i am lost when navigating solely using my notes. I still need the Notebook or Index Note available, to be able to have an overview of all note. With my idea, you have a link to the index with every seperate note. So no double index as you mentioned. See explanation in image.
I am more and more using the linked note feature. But i always have to put a link back to my so to speak "table of contents". This will make it easier to navigate back and fort in linked notes. So make it possible to auto add the link to the "Index" note.