# HTML Essentials
Essential HTML concepts, techniques, and best practices for modern web development.
## HTML Comments
Comments add notes to code without affecting display. Browsers ignore comments.
**Syntax**:
```html
```
**Usage**:
- Add explanatory notes about code
- Temporarily disable HTML without deleting it
- Document complex sections
- Leave notes for collaborators
**Rules**:
- Can be placed before/after DOCTYPE and ``
- Can be used as content in most elements
- **Cannot** be used inside tags (e.g., within attributes)
- **Cannot** be nested
- Not allowed in `