obsidian-markdown

Use wikilink syntax with double brackets, such as [[Note Name]], optionally with custom display text like [[Note Name|Display Text]]. You can also link to specific headings with [[Note Name#Heading]] or to blocks using [[Note Name#^block-id]].

Prefix a wikilink with an exclamation mark, such as ![[image.png]] or ![[document.pdf#page=3]]. Images support sizing like ![[image.png|300]] for width, and external images use standard Markdown syntax with an optional width parameter.

Obsidian supports 13 callout types including note, tip, warning, info, danger, bug, example, quote, success, failure, question, abstract, and todo, many with aliases. Callouts can be foldable with + or - suffixes and can be nested inside each other.

Use [[wikilinks]] for notes within the vault because Obsidian automatically updates them when notes are renamed. Use standard [text](url) Markdown links only for external URLs outside the vault.

Obsidian tags can contain letters in any language, numbers (not as the first character), underscores, hyphens, and forward slashes for nested tags like #project/active. Tags can be written inline or listed under the tags property in frontmatter.