Map of Content

A type of Higher-Order Note to provide organisational structure for the purposes of navigation and retrieval.

Some Other Maps of Content

Links here

An evergreen note is a unit of knowledge

This may leave the outer note as a structure note, or a Map of Content, although it is better to Prefer organic structure to hierarchical structure.
Take Smart Notes

Use a Map of Content to structure notes and give a workspace to flesh out a topic, or idea.