Markdown
Coeus uses standard Markdown. If you already know Markdown, everything you know works. If you don't, here's what you need.
The basics
# Heading 1
## Heading 2
### Heading 3
Regular paragraph text.
**bold** and *italic*
- bullet list item
- another item
1. numbered list
2. second item
Code blocks
Wrap code in triple backticks. You can add a language name for syntax highlighting:
```python
def hello():
print("hello")
```
Links
[link text](https://example.com)
For links to other notes, use wiki-links instead: see Wiki-links.
Images

Or drop an image into the editor and it gets copied into your notes folder automatically.
Diagrams
Coeus renders Mermaid diagrams. Write a code block with the language set to mermaid:
```mermaid
graph TD
A[Start] --> B{Decision}
B -->|Yes| C[Do it]
B -->|No| D[Skip it]
```
Mermaid supports flowcharts, sequence diagrams, Gantt charts, and more. The preview updates when you save.
Tables
| Column 1 | Column 2 |
|----------|----------|
| cell | cell |
Blockquotes
> This is a quote or note.
Task checkboxes
- [ ] unchecked task
- [x] checked task
These are just visual checkboxes in the preview. For real task tracking with due dates and priorities, see Tasks.
What doesn't work
Coeus doesn't support HTML in notes. Raw HTML inside a Markdown note gets sanitized before display. Stick to Markdown syntax.