Brain syntax cheat sheet

Syntax	Meaning
`[[Note]]`	Wikilink
`[[Note\|Alias]]`	Wikilink with display text
`[[arc://Person/id]]`	Link to an ARC entity
`![[Note]]`	Include / transclusion
`![[Note#Heading]]`	Section include
`![[arc://view/name]]`	Saved database view
`![[arc://Person/…]]`	Entity embed
`![[arc://metric/KEY?days=30]]`	Analytics metric sparkline embed (`days` 7–365, optional `param=`)
```mermaid	Diagram (rendered in preview)
```youtube	YouTube embed (URL on next line)
```iframe / ```web	Embed a web page
```gif / ```image	Image / GIF
```callout	Styled callout (`info` / `tip` / `warning` / `danger`)
```arc-graph / ```graph	Local force-graph (`noteId:` / `depth:` optional; defaults to host note)
Page header	Note setting: designed title banner (subtitle + optional image) in preview/publish
Publish page	Per-note public URL `/brain/p/:slug` — body only; linked notes stay private

Editor helpers

Type / for slash commands (heading, table, mermaid, youtube, callout, wikilink, embed, every entity type)
Type [[ for autocomplete over Brain notes and ARC entities
Sidebar Link ARC entities attaches ABOUT links and inserts [[arc://Type/id|Label]]