yii2-bootstrap5/docs/guide/basic-usage.md

Basic Usage
===========

Yii doesn't wrap the bootstrap basics into PHP code since HTML is very simple by itself in this case. You can find details
about using the basics at [bootstrap documentation website](https://getbootstrap.com/docs/). Still Yii provides a
convenient way to include bootstrap assets in your pages with a single line added to `AppAsset.php` located in your
`@app/assets` directory:

```php
public $depends = [
    'yii\web\YiiAsset',
    'yii\bootstrap5\BootstrapAsset', // this line
];
```

Using bootstrap through Yii asset manager allows you to minimize its resources and combine with your own resources when
needed.