Post Thumbnail URL CPT

if ( has_post_thumbnail() ) {
    $thumbnail_url = get_the_post_thumbnail_url( get_the_ID(), 'full' );
    echo '<img src="' . esc_url( $thumbnail_url ) . '" alt="' . esc_attr( get_the_title() ) . '">';
} else {
    echo 'No featured image set for this post.';
}

### Explanation:
1. **`has_post_thumbnail()`**: Checks if the current post has a featured image.
2. **`get_the_post_thumbnail_url()`**: Retrieves the URL of the featured image. The `full` parameter ensures that you get the full-size image URL.
3. **`get_the_ID()`**: Gets the ID of the current post.
4. **`esc_url()` and `esc_attr()`**: Escapes the URL and the title for safe output.

### Usage:
– Place the code inside the WordPress loop for your Custom Post Type template (e.g., `single-{cpt}.php`).
– Replace `{cpt}` with the slug of your Custom Post Type.

Let me know if you need further assistance!

$stylesheet_directory_uri = get_stylesheet_directory_uri();
echo $stylesheet_directory_uri;

### Explanation:
– **`get_stylesheet_directory_uri()`**: Retrieves the URL of the current theme's directory. If you're using a child theme, this will return the child theme's directory URL.
– It is different from `get_template_directory_uri()`, which always returns the URL of the parent theme's directory.

### Example Usage:
If you want to include a CSS file located in your theme's directory, you can use this function as follows:

echo '<link rel="stylesheet" href="' . esc_url( get_stylesheet_directory_uri() . '/style.css' ) . '">';

This will output the link to the `style.css` file in your theme's directory.

Let me know if you have specific use cases or further questions!