etting excerpt in loop within loop – Twenty sixteen theme

Hello fellow wordpress expirienced users.
I’m having a struggle while doing a latest 3 posts excerpt with thumbnail in my homepage.
I tried various possibilities but i cant get it running.
The goal is to look the posts like this:
https://caenthemes.cekuj.net/?s=p%C5%99%C3%ADsp%C4%9Bvek
but i was only able to go here: https://caenthemes.cekuj.net/
The code of the main page:

<?php
/**
 * The template for displaying main-page without title.
 * @package WordPress
 * @subpackage Twenty_Sixteen
 * @since Twenty Sixteen 1.0
 */
?>

<section id="post-<?php the_ID(); ?>" <?php post_class(); ?>>
    <!--<header class="entry-header">
    <?php the_title('<h1 class="entry-title">', '</h1>'); ?>
    </header><!-- .entry-header -->
    <div class="wp-page-content">
        <?php
        the_content();
        wp_link_pages(array(
            'before' => '<div class="page-links"><span class="page-links-title">' . __('Pages:', 'twentysixteen') . '</span>',
            'after' => '</div>',
            'link_before' => '<span>',
            'link_after' => '</span>',
            'pagelink' => '<span class="screen-reader-text">' . __('Page', 'twentysixteen') . ' </span>%',
            'separator' => '<span class="screen-reader-text">, </span>',
        ));
        ?>
    </div><!-- .entry-content -->
</section>   
<section>
    <header class="entry-header">
        <h2>
            <?php
            if (get_locale() == 'cs_CZ') {
                echo "Nejnověj?í p?íspěvky";
            } else {
                echo "Latest posts";
            }
            ?>
        </h2>
    </header><!-- .entry-header -->

    <?php
    $args = array(
        'posts_per_page' => 3,
        'offset' => 0,
        'category' => '',
        'category_name' => '',
        'orderby' => 'date',
        'order' => 'DESC',
        'include' => '',
        'exclude' => '',
        'meta_key' => '',
        'meta_value' => '',
        'post_type' => 'post',
        'post_mime_type' => '',
        'post_parent' => '',
        'author' => '',
        'author_name' => '',
        'post_status' => 'publish',
        'suppress_filters' => true
    );
    $myposts = get_posts($args);
    foreach ($myposts as $post) : setup_postdata($post);
        get_template_part('template-parts/content', 'search');
    endforeach;
    wp_reset_postdata();
    ?>
</section><!-- #wp-page-content-## -->

I’m 80% sure that i’m not handling right the inner loop within the main loop of twenty sixteen. Just to cover all posibilities i was also trying to do it not via get template but still i only get the posts categories titles and thumbnails but not the excerpt.
Can you help me with this ?
The whole page is based on twenty sixteen theme with my modifications.
Thank you very much,
Caen Ragestorm