Rules I use for Card Placement in my Zettelkasten 

I love the example as I am a subscriber to both of your letters. Yes, please continue making videos on your numbering system :-)

This was insightful and pleasant to watch and listen to. Thank you.

You show how to welcome the challenge of having no already-perfect place for a lone card that rides in with new information. You create an opening, housing it where it can raise relevant questions. Your thoughtful indexing ensures that you can go right to it.