MoC
An MoC is a page with a collection of related links, organized together for useful access. It's a signpost to idea destinations.
It results from bottom-up or divergent / emergent idea creation, doesn't precede it.
It is flexible and may change or be deleted. It is not strictly necessary in Scrapbox, but can be helpful.
Rather than a Table of Contents or Index page which is written as a rigid conclusion or top-down hierarchical decision.
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Nick Milo has written extensively on the topic.