Hub notes get written by hand when one topic spreads across too many files to hold in memory.

## Key Concept

- Hand-curated hub when one topic sprawls past what memory can hold.
- Level 1: When one topic spreads across too many files, write one hub page that links them - like a table of contents you draw by hand when your binder gets messy.
- Level 2: A map of content is a hand-built table of contents when one topic outgrows memory - link the sprawl in one hub.
- Level 3: MOCs appear when you open six files to answer one question - the hub beats whatever the folder tree implies.
- Level 4: Write the MOC when search fails you twice on the same topic - curate by hand, do not wait for auto-indexing.
- Level 5: [Linking by Meaning](/concepts/linking-by-meaning.md) builds the graph; [Network Analysis](/concepts/network-analysis.md) finds hubs - a hand MOC wins when metrics cannot replace judgment about what belongs together.
- A table of contents written by hand beats whatever the folder tree implies.
- Write the MOC when you keep opening six files to answer one question.

## Maps

### Foundations

- [PKM](/concepts/pkm.md)
- [Building a Second Brain](/concepts/building-a-second-brain.md)
- [The Second Brain Workflow](/concepts/the-second-brain-workflow.md)
- [Atomic Notes](/concepts/atomic-notes.md)
- [Maps of Content](/hubs/maps-of-content/index.md)
- [Getting Started](/hubs/getting-started/index.md)

### Capture

- [Capture](/concepts/capture.md)
- [Context-Aware Capture](/concepts/context-aware-capture.md)
- [Analog Capture Tools](/concepts/analog-capture-tools.md)
- [Mobile Capture Workflows](/concepts/mobile-capture-workflows.md)
- [The Trusted Inbox](/concepts/the-trusted-inbox.md)
- [Signal vs Noise](/concepts/signal-vs-noise.md)

### Organize

- [PARA Method](/concepts/para-method.md)
- [GTD vs PARA](/concepts/gtd-vs-para.md)
- [Metadata Strategy](/concepts/metadata-strategy.md)
- [Daily Notes](/concepts/daily-notes.md)

### Distill & review

- [Layered Reading](/concepts/layered-reading.md)
- [Weekly Review Checklists](/concepts/weekly-review-checklists.md)
- [Periodic Knowledge Review](/concepts/periodic-knowledge-review.md)
- [Evergreen Notes](/concepts/evergreen-notes.md)
- [Evergreen vs Fleeting Notes](/concepts/evergreen-vs-fleeting-notes.md)

### Connect & explore

- [Linking by Meaning](/concepts/linking-by-meaning.md)
- [Graph View Analytics](/concepts/graph-view-analytics.md)
- [Digital Serendipity](/concepts/digital-serendipity.md)
- [Mind Mapping](/concepts/mind-mapping.md)

### Express

- [Creative Output](/concepts/creative-output.md)
- [Drafting in Public](/concepts/drafting-in-public.md)
- [Synthesis as a Goal](/concepts/synthesis-as-a-goal.md)
- [Creative Blocks](/concepts/creative-blocks.md)

### Systems & tools

- [Digital Garden](/concepts/digital-garden.md)
- [Local-first Software](/concepts/local-first-software.md)
- [Future-Proofing Knowledge](/concepts/future-proofing-knowledge.md)