wp-enqueue.php

<?php
/* == Queue up all css & js files ==================================================== */
function theme_scripts_styles() {
	// JS
	/** Removes WP stock jQuery
	 * https://developer.wordpress.org/reference/functions/wp_deregister_script/
	*/
	wp_deregister_script( 'jquery' );
	
	/** Adds jQuery from a CDN, loads in the footer
	 * https://developers.google.com/speed/libraries
	*/
	wp_enqueue_script( 'jquery', '//ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js', array(), null, true );
    
	/** Adds jQuery Cookie Scripts from CDN, loads in footer
	 * https://cdnjs.com/libraries/jquery-cookie
	*/
	wp_enqueue_script( 'js-cookies', '//cdnjs.cloudflare.com/ajax/libs/jquery-cookie/1.4.1/jquery.cookie.min.js', array('jquery'), null, true );
	
	/** Adds Slick Slider Scripts from CDN, loads in footer
	 * https://cdnjs.com/libraries/slick-carousel
	*/
	wp_enqueue_script( 'slick-js', '//cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.8.1/slick.min.js', array('jquery'), null, true );

	// CSS
	/** Adds Slick Slider CSS from CDN
	 * https://cdnjs.com/libraries/slick-carousel
	*/
	wp_enqueue_style( 'slick-css', '//cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.8.1/slick.min.css' );
	wp_enqueue_style( 'slick-theme', '//cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.8.1/slick-theme.min.css' );

	/** Removes dashicons in frontend to non-logged-in users
	 * https://developer.wordpress.org/reference/functions/is_user_logged_in/
	 * https://developer.wordpress.org/reference/functions/wp_deregister_style/
	*/
	if ( !is_user_logged_in() ) {
		wp_deregister_style( 'dashicons' );
	}
}
add_action( 'wp_enqueue_scripts', 'theme_scripts_styles' );