Add scripts to WP

enqueue-scripts-on-wp.php

<?php

/** General add scripts **/
function adding_scripts_to_footer() {
	// jQuery is already a part of the WP library. See: https://developer.wordpress.org/reference/functions/wp_enqueue_script/
	wp_enqueue_script('jquery');
	
	// Additional scripts, it's best to always register and then enqueue
	wp_register_script('my_amazing_script', plugins_url('../js/amazing_script.js', _FILE_), array('jquery'), '1.1', true);
	wp_enqueue_script('my_amazing_script');
	wp_register_script('main-js', plugins_url('../js/script.js', _FILE_), array('jquery'), '1.0', true);
	wp_enqueue_script('main-js');
}
add_action ('wp_enqueue_scripts', 'adding_scripts_to_footer');

/** Add a script on a specific page **/
function adding_page_scripts() {
  if (is_home() || is_front_page()) {
	  wp_register_script('my_home_script', plugins_url('../js/home_script.js', _FILE_), array('jquery'), '1.05', true);
	  wp_enqueue_script('my_home_script');
  }
  if (is_home() || is_front_page()) {
	  wp_register_script('my_home_script', plugins_url('../js/home_script.js', _FILE_), array('jquery'), '1.05', true);
	  wp_enqueue_script('my_home_script');
  }
  if (is_page( array( 'about-us', 'contact', 'management' ) ) {
	 wp_register_script('pagescript', plugins_url('../js/page_script.js', _FILE_), array('jquery'), '1.75', true);
	 wp_enqueue_script('pagescript');
  }
}
add_action ('wp_enqueue_scripts', 'adding_page_scripts');

/** add a script if a shortcode exists**/
function script_for_shortcode($content) {
    if ( has_shortcode($content, "hello-shortcode") ) {
        wp_register_script( 'plugin_script', plugins_url('../js/hello-shortcode.js'), array(), '1.0', true );
        wp_enqueue_script('plugin_script');
    }
}
add_filter( 'the_content', 'script_for_shortcode');

/** Add stylesheets **/
function theme_stylesheets() {
    wp_enqueue_style( 'carousel-sheet',  get_template_directory_uri() .'/css/carousel.css', array(), null, 'all' );
    wp_enqueue_style( 'mailstyle', get_stylesheet_uri(), '', null, 'all' );
}
add_action( 'wp_enqueue_scripts', 'theme_stylesheets' );

?>