Adding custom CSS and JS files in WordPress should always be done using the wp_enqueue_scripts hook. This method ensures your styles and scripts are integrated smoothly and won’t break your theme or other plugins.

Why Use wp_enqueue_scripts?

Instead of directly placing styles or scripts into your template files, this hook helps you:

• Avoid Conflicts: Prevents duplicate script loading and avoids compatibility issues.
• Handle Dependencies: Ensures that required libraries like jQuery are loaded before your code.
• Boost Speed: Loads assets only when required, optimizing performance.

The functions wp_enqueue_script() and wp_enqueue_style() make sure everything loads correctly in the document head or footer.

Sample: Enqueuing Scripts and Styles

Add this code to your theme’s functions.php file:

function custom_enqueue_assets() {
    wp_enqueue_script('site-script', get_template_directory_uri() . '/js/site-script.js', array('jquery'), '1.0', true);
    wp_enqueue_style('site-style', get_template_directory_uri() . '/css/site-style.css', array(), '1.0');
}
add_action('wp_enqueue_scripts', 'custom_enqueue_assets');

Explanation

• wp_enqueue_script includes your JS file and sets jQuery as a dependency.
• wp_enqueue_style adds your CSS without any dependencies.

Ensure your file paths match your theme’s structure. This best practice method ensures that your site stays clean and compatible.

Conclusion

Follow this approach to add scripts and styles properly in WordPress. It ensures better performance, fewer bugs, and cleaner theme development. Refer to the WordPress Codex for advanced details.