# H1
## H2
### H3
#### H4
##### H5
###### H6
*Italic* or _Italic_
**Bold** or __Bold__
~~Strikethrough~~
- Item 1
- Item 2
- Subitem 2.1
- Subitem 2.2
1. First item
2. Second item
1. Subitem 2.1
2. Subitem 2.2
[OpenAI](https://openai.com)
[GitHub](https://github.com)

`inline code`
```python
print("Hello, world!")
```javascript
console.log("Hello, world!");
```c++
#include <iostream>
int main() {
std::cout << "Hello, world!" << std::endl;
return 0;
}
### Blockquotes
```markdown
> This is a blockquote.
| Header 1 | Header 2 |
|----------|----------|
| Row 1 | Data 1 |
| Row 2 | Data 2 |
- [x] Task 1
- [ ] Task 2
---
\*This is not italic\*
# Project Title
## Table of Contents
- [Introduction](#introduction)
- [Installation](#installation)
- [Usage](#usage)
- [Contributing](#contributing)
- [License](#license)
## Introduction
Briefly describe your project.
## Installation
```sh
# Install dependencies
git clone https://github.com/your-repo.git
cd your-repo
npm install
# Run the project
npm start
Guidelines for contributing.
Specify the license.