Thank you so much for all the suggestions. I'll update the diagram in the next few days.

We plan to go through the whole list with video explanations. So far, we have done two: Consistent hashing: https://www.youtube.com/watch?v=UF9Iqmg94tk Geohash/Quadtree: https://www.youtube.com/watch?v=M4lR_Va97cQ