I want to customize the CSS of the Traveler theme on the Child-theme, how to include CSS in Child-theme?

You need to add the function below in the Child-theme

				
					function chiltheme_enqueue_styles() {
 
    $parent_style = 'traveler';
 
    wp_enqueue_style( $parent_style, get_template_directory_uri() . '/style.css' );
    wp_enqueue_style( 'child-style',
        get_stylesheet_directory_uri() . '/style.css',
        array( $parent_style ),
        wp_get_theme()->get('Version')
    );
}
add_action( 'wp_enqueue_scripts', 'chiltheme_enqueue_styles' );
				
			

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