What is the wrong with this function to enqueue the scripts and styles to the theme? [closed]

The only things I would change:

  1. You’re including a version of jQuery that is different than the one that is included with WordPress. You should de-register the WP version first so that aren’t 2 copies/versions of jQuery loaded on the page
  2. select2jquery should have jquery as a dependency so that you make sure is loaded after jQuery
  3. The 3rd parameter of wp_register_script if you’re not using should be by default an empty array
  4. The last parameter of wp_register_style is expecting the media for which this stylesheet has been defined and by default is ‘all’ (you’re passing a boolean true).

I would change to this:

function custom_scripts_css_with_jquery() {

    wp_deregister_script('jquery');
    wp_register_script( 'jquery', 'https://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js', array(), null, true);
    wp_register_script( 'select2jquery', 'https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/js/select2.min.js',array('jquery'), null, true );
    wp_register_style( 'select2mincss', 'https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/css/select2.min.css' );  // the rest of parameters are the default

    // For either a plugin or a theme, you can then enqueue the style:
    wp_enqueue_script( 'select2jquery' );
    wp_enqueue_script( 'jquery' );
    wp_enqueue_style( 'select2mincss' );
    //wp_enqueue_script( 'Bootstrap_min_js');

}
add_action( 'wp_enqueue_scripts', 'custom_scripts_css_with_jquery' );

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