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// wp-confg.php
define('DISALLOW_FILE_EDIT', true);

// into wp-config.php
define('Force_SSL_Admin', true);

// functions.php
<?php
function sp_hide_errors() {
  // We return a message
  return "Nope";
}
add_filter('login_errors', 'sp_hide_errors');
?>

// functions.php
add_action( 'admin_bar_menu', 'sp_remove_wp_logo', 999 );
function sp_remove_wp_logo( $wp_admin_bar ) {
  $wp_admin_bar->remove_node( 'wp-logo' );
}

// into any page or template
<?php 
$image = get_field('image');
if( !empty( $image ) ): ?>
  <img src="<?php echo esc_url($image['url']); ?>" alt="<?php echo esc_attr($image['alt']); ?>" />
<?php endif; ?>

// into any page or template
<?php
// Check rows exists.
if( have_rows('repeater_field_name') ):
  // Loop through rows.
  while( have_rows('repeater_field_name') ) : the_row();
    // Load sub field value.
    $sub_value = get_sub_field('sub_field');
    // Do something...
  // End loop.
  endwhile;
// No value.
else :
  // Do something...
endif;
?>

// into any page or template
<?php 
if( get_field('text_field') ): 
    the_field('text_field'); 
endif; 
?>

// into any page or template
<?php 
  the_field('text_field'); 
?>

// into any page or template
<?php
include_once( ABSPATH . WPINC . '/feed.php' );
// Get a feed object from the specified feed source.
$rss = fetch_feed( 'https://snippress.co/feed/' );
if ( ! is_wp_error( $rss ) ) : // Checks that the object is created correctly
  // Figure out how many total items there are, but limit it to 5. 
  $maxitems = $rss->get_item_quantity( 5 ); 
  // Build an array of all the items, starting with element 0 (first element).
  $rss_items = $rss->get_items( 0, $maxitems );
endif;
?>
<ul>
  <?php if ( $maxitems == 0 ) : ?>
    <li><?php _e( 'No items', 'my-text-domain' ); ?></li>
  <?php else : ?>
    <?php // Loop through each feed item and display each item as a hyperlink. ?>
    <?php foreach ( $rss_items as $item ) : ?>
      <li>
        <a href="<?php echo esc_url( $item->get_permalink() ); ?>"
        title="<?php printf( __( 'Posted %s', 'my-text-domain' ), $item->get_date('j F Y | g:i a') ); ?>">
        <?php echo esc_html( $item->get_title() ); ?>
        </a>
      </li>
    <?php endforeach; ?>
  <?php endif; ?>
</ul>

// functions.php
function dequeue_jquery_migrate( &$scripts ){
  if( !is_admin() ) {
    $scripts->remove( 'jquery');
    $scripts->add( 'jquery', false, array( 'jquery-core' ), '1.10.2' );
  }
}
add_filter( 'wp_default_scripts', 'dequeue_jquery_migrate' );

Read : Reasons to dequeue this script