Grabbed Post ID under WP loop, but still couldn’t Print Post title

by

Since you’re in a Loop, you don’t need to grab the post ID or use get_the_title(). Instead, replace line 2 and 3 of your code with:

the_title('<h1>', '</h1>');

Or, if you want to include a link as well:

<h1><a href="https://wordpress.stackexchange.com/questions/272948/<?php the_permalink(); ?>"><?php the_title(); ?></a></h1>