Why is my custom template not showing anything?

Question

UPDATE 1: I tried creating a new page and the header and footer is showing, but not the posts. UPDATE 2: If I update the Reading settings to Post page and select the page I created with the custom template, nothing is showing.

<?php /* Template Name: Blog Template */ ?>

<?php get_header(); ?>

<h1>Blog posts</h1>

<div class="container">
    <?php while(have_posts()): the_post(); ?>
    <?php the_content(); ?>
    <?php endwhile; ?>
</div>

<?php get_footer(); ?>

Answer 1

The template for displaying all your posts should not be a custom page template. You should set the page you want to use as your Posts page in Settings > Reading. Then, as per the Template Hierarchy, your theme will automatically use home.php for this page, or index.php if that does not exist.

So you should save your template as home.php, without the /* Template Name: Blog Template */ comment, and set the page you want to use for displaying posts in Settings > Reading.