WP-Query Add Pagination

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Firstly you have your while loop to run through all your posts.
And above your while loop you have your args.

You need to add this arg

$args['paged'] = $paged;

Below is a template to start your while loop

  $args['post_type'] = 'post';

  $query = new WP_Query($args);

  while ( $query->have_posts() ) : the_post(); ?>
    <?php 
      $query->the_post(); 
      $post_id = get_the_ID();
    ?>
    <div class="card">
      <a href="<?php the_permalink(); ?>" class="card-header text-center">
        <?php
          the_title();
        ?>
      </a>
      <div class="card-body">
        <?php
          the_content();
        ?>  
      </div>
    </div>
<?php endwhile; ?>

Your Args must be before your Query!

Then after your endwhile. Paste this code to display your pagination links

<div class="pagination">
    <?php 
        echo paginate_links( array(
            'base'         => str_replace( 999999999, '%#%', esc_url( get_pagenum_link( 999999999 ) ) ),
            'total'        => $query->max_num_pages,
            'current'      => max( 1, get_query_var( 'paged' ) ),
            'format'       => '?paged=%#%',
            'show_all'     => false,
            'type'         => 'plain',
            'end_size'     => 2,
            'mid_size'     => 1,
            'prev_next'    => true,
            'prev_text'    => sprintf( '<i></i> %1$s', __( 'Previous', 'text-domain' ) ),
            'next_text'    => sprintf( '%1$s <i></i>', __( 'Next', 'text-domain' ) ),
            'add_args'     => false,
            'add_fragment' => '',
        ) );
    ?>
</div>