How to show one post different from the rest?

the code I am using below will show the last 5 post in whatever category I choose, but I was wondering, How can I get it so that the first post shows different from the other 4?

I want the first post to show the thumbnail and the title under it and the rest to show titles. I found a code on a recent post on here but it’s closed, so I couldn’t comment and ask questions.

Here is the code I’m using

<?php
$queryObject = new  Wp_Query( array(
    'showposts' => 5,
    'post_type' => array('post'),
    'category_name' => videos,
        'orderby' => 1,
    ));

// The Loop
if ( $queryObject->have_posts() ) :
  $i = 0;
  while ( $queryObject->have_posts() ) :
      $queryObject->the_post();
      ?>
      <?php if ( $i == 0 ) : ?>
          <div class="first-post">
      <?php endif; ?>
      <a href="<?php the_permalink(); ?>" title="<?php printf(__( 'Read %s', 'wpbx' ), wp_specialchars(get_the_title(), 1)) ?>">
          <?php the_post_thumbnail('sidethumbs'); ?>
      </a>

      <a href="<?php the_permalink(); ?>"><?php the_title(); ?></a>
      <?php if ( $i == 0 ) : ?>
          </div>
      <?php endif; ?>    
      <?php $i++; ?>
  <?php endwhile; ?>

It’s working but the problem is, I don’t know where to begin the second styling or how to begin it which the person failed to explain, can anyone help me.