How to Enque Boostrap with WordPress

enque-bootstrap.php

<?php
//* Do NOT include the opening php tag shown above. 

add_action( 'wp_enqueue_scripts', 'custom_load_bootstrap' );
/**
 * Enqueue Bootstrap.
 */
function custom_load_bootstrap() {
    wp_enqueue_style( 'bootstrap-css', '//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css' );
    wp_enqueue_script( 'bootstrap-js', '//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js', array( 'jquery' ), CHILD_THEME_VERSION, true );
// Compiled versions
    wp_enqueue_script( 'jquery-js', '//code.jquery.com/jquery-3.2.1.slim.min.js', array( 'jquery' ), CHILD_THEME_VERSION, true );
    wp_enqueue_script( 'jquery-js', '//cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js', array( 'jquery' ), CHILD_THEME_VERSION, true );

    
    


}


//
//If CHILD_THEME_VERSION is not set in your child theme, it can be done like so:
//
//Copy to clipboard
//define( 'CHILD_THEME_VERSION', '2.3.0' );
// To get the URLs of the current latest versions of css and js files, go:
// http://getbootstrap.com/docs/4.0/getting-started/download/#bootstrap-cdn