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

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+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](https://getbootstrap.com/docs/). Still Yii provides a convenient
+way to include Bootstrap assets in your pages with a line(s) added to `@app/assets/AppAsset.php`(basic application):
+
+```php
+public $depends = [
+    <...>
+    yii\bootstrap5\BootstrapAsset::class,
+    // optional, Bootstrap icons
+    // yii\bootstrap5\BootstrapIconAsset::class
+];
+```
+
+Using Bootstrap through Yii asset manager allows you to minimize its resources and combine with your own resources when
+needed.