Srijan Mitra

<?php get_template_part( ‘content’, ‘page’ ); ?>

This section is defined your content. You don’t need to post individually <?php the_post(); ?>.

Else you can do one thing … just remove …
<?php get_template_part( ‘content’, ‘page’ ); ?>

… And instead of that just paste there …..

<?php while (have_posts()) : the_post(); ?>

<h2><?php the_title(); ?></h2>
<p><?php the_content();?></p>

<?php endwhile; ?>

And the_post() is different its located at wp-includes/query.php.

So good luck.