WordPress loop breaking page, loading blank page - php

Question

I'm an apprentice WP developer and am trying to wrap up a project for work. I'm trying to loop in the first 6 or so posts on the homepage, but every time I add the loop the page breaks and loads empty (except for the header).
I'm using the HTML5 blank WordPress theme as the basis for the custom theme I'm developing and using ACF to create a custom page builder. The homepage is loading from page.php. Running WP 4.9.5.
<?php $args = array ( 'post_type' => 'post' );
$post_query = new WP_Query($args); ?>
<?php if($post_query->have_posts()): ?>
<?php while($post_query->have_posts() : $post_query->thepost(); ?>
<h2>THIS IS A TEST</h2>
<?php wp_reset_postdata(); endwhile; ?>
<?php else :?>
<p>Whoops. No posts.</p>
<?php endif; ?>

Answer 1

This is your problem: $post_query->thepost();. It should be: $post_query->the_post();. And you're missing a parenthesis after while($post_query->have_posts().
Also, wp_reset_postdata() should be called after the while loop.
Here's the updated code (with a couple of tweaks):
<?php
$args = array (
'post_type' => 'post'
);
$post_query = new WP_Query($args);
if ( $post_query->have_posts() ):
while( $post_query->have_posts() ) : $post_query->the_post(); ?>
<h2><?php the_title(); ?></h2>
<?php
endwhile;
wp_reset_postdata();
?>
<?php
else : // No posts found.
?>
<p>Whoops. No posts.</p>
<?php
endif;