Add javascript to WordPress

wordpress-javascript.php

<?php

// Add inline javascript before </head>
add_action( 'wp_head', 'header_inline_script' );
function header_inline_script() {
  ?>
  <script>
  </script>
  <?php
}

// Add inline javascript before </body>
add_action( 'wp_footer', 'footer_inline_script' );
function footer_inline_script() {
  ?>
  <script>
  </script>
  <?php
}

// Add script load before </head>
add_action( 'wp_enqueue_scripts', 'header_script_load' );
function header_script_load() {
  wp_enqueue_script( 'my-custom-script', get_stylesheet_directory_uri() . '/custom-scripts', array( 'jquery' ) );
}

// Add script load before </body>
add_action( 'wp_enqueue_scripts', 'footer_script_load' );
function footer_script_load() {
  wp_enqueue_script( 'my-custom-script', get_stylesheet_directory_uri() . '/custom-scripts', array( 'jquery' ), true );
}