index.php

<?php
/**
 * The main template file
 *
 * This is the most generic template file in a WordPress theme
 * and one of the two required files for a theme (the other being style.css).
 * It is used to display a page when nothing more specific matches a query.
 * E.g., it puts together the home page when no home.php file exists.
 *
 * @link https://developer.wordpress.org/themes/basics/template-hierarchy/
 *
 * @package Gaia
 */

get_header();
?>

<main id="primary" class="site-main">

    <?php
if (have_posts()):

    if (is_home() && !is_front_page()):
    ?>
    <header>
        <h1 class="page-title screen-reader-text"><?php single_post_title();?></h1>
    </header>
    <?php
endif;

/* Start the Loop */
while (have_posts()):
    the_post();

    /*
     * Include the Post-Type-specific template for the content.
     * If you want to override this in a child theme, then include a file
     * called content-___.php (where ___ is the Post Type name) and that will be used instead.
     */
    get_template_part('template-parts/content', get_post_type());

endwhile;

the_posts_navigation();

else:

    get_template_part('template-parts/content', 'none');

endif;
?>

</main><!-- #main -->

<?php
get_footer();