Modifying parent theme files directly is an amateur mistake. When the parent theme updates, all custom adjustments get completely wiped out. Building a WordPress Child Theme isolates your modifications completely.
Setting Up Your child style.css
Create a folder named yourtheme-child and place a style.css file inside with the following absolute minimum header comments:
/* Theme Name: Hello Elementor Child Template: hello-elementor Version: 1.0.0 */
The Correct Way to Enqueue Scripts
Never hardcode paths via header templates. Always use the functions.php layout using wp_enqueue_style() hooks to smoothly bind styles without blocking load performance.