Markdown

# Heading 1
## Heading 2
### Heading 3

**bold text**
*italic text*
~~strikethrough~~
`inline code`

> Blockquote
> multi-line

---  (horizontal rule)

[Link text](https://example.com)
[Link with title](https://example.com "Title")
![Alt text](image.png)

Line break: end a line with two spaces  
or use a blank line for a new paragraph.

# Unordered list
- Item one
- Item two
  - Nested item

# Ordered list
1. First
2. Second
3. Third

# Task list (GFM)
- [x] Completed task
- [ ] Pending task

# Table
| Name  | Age | City       |
|-------|-----|------------|
| Alice | 30  | New York   |
| Bob   | 25  | London     |

# Fenced code block
```python
def hello():
    print("Hello!")
```