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// https://www.smashingmagazine.com/2017/12/customizing-admin-columns-wordpress/

// ADD COLUMNS
add_filter( 'manage_realestate_posts_columns', 'smashing_filter_posts_columns' );
function smashing_filter_posts_columns( $columns ) {
  $columns['image'] = __( 'Image' );
  $columns['price'] = __( 'Price', 'smashing' );
  $columns['area'] = __( 'Area', 'smashing' );
  return $columns;
}

// REORDER COLUMNS
add_filter( 'manage_realestate_posts_columns', 'smashing_realestate_columns' );
function smashing_realestate_columns( $columns ) {
    $columns = array(
      'cb' => $columns['cb'],
      'image' => __( 'Image' ),
      'title' => __( 'Title' ),
      'price' => __( 'Price', 'smashing' ),
      'area' => __( 'Area', 'smashing' ),
    );
  return $columns;
}