1# Properties (Frontmatter) Reference
2 
3Properties use YAML frontmatter at the start of a note:
4 
5```yaml
6---
7title: My Note Title
8date: 2024-01-15
9tags:
10  - project
11  - important
12aliases:
13  - My Note
14  - Alternative Name
15cssclasses:
16  - custom-class
17status: in-progress
18rating: 4.5
19completed: false
20due: 2024-02-01T14:30:00
21---
22```
23 
24## Property Types
25 
26| Type | Example |
27|------|---------|
28| Text | `title: My Title` |
29| Number | `rating: 4.5` |
30| Checkbox | `completed: true` |
31| Date | `date: 2024-01-15` |
32| Date & Time | `due: 2024-01-15T14:30:00` |
33| List | `tags: [one, two]` or YAML list |
34| Links | `related: "[[Other Note]]"` |
35 
36## Default Properties
37 
38- `tags` - Note tags (searchable, shown in graph view)
39- `aliases` - Alternative names for the note (used in link suggestions)
40- `cssclasses` - CSS classes applied to the note in reading/editing view
41 
42## Tags
43 
44```markdown
45#tag
46#nested/tag
47#tag-with-dashes
48#tag_with_underscores
49```
50 
51Tags can contain: letters (any language), numbers (not first character), underscores `_`, hyphens `-`, forward slashes `/` (for nesting).
52 
53In frontmatter:
54 
55```yaml
56---
57tags:
58  - tag1
59  - nested/tag2
60---
61```
62