Adding pagination to query for custom page

If you are going to paginate the query in future, I recommend the following

• Changing to WP_Query instead as it is better suited for paginated queries.

• Although you still have less than 5 posts, you can make your query pagination ready by adding the paged parameter to your query

• Your use of wp_reset_query() is incorrect. That is used in conjuction with query_posts which you should never use. You should be using wp_reset_postdata(). Also, you don’t need to reset the main query, it is already done.

• Just a tip, use curlies instead of : and endif and endwhile. It is easier to debug and almost all if not all code editors support this syntax

You can try something like this

if ( have_posts() ) { 
    while ( have_posts() ) { 
        the_post();

        the_content(); ?>
        <div class="line2"></div>
    <?php } 
}
?>

<!-- Start latest post -->
<?php
$paged = get_query_var( 'paged' ) ? get_query_var( 'paged' ) : 1;
$latest_post = new WP_Query( 'numberposts=5&paged=' . $paged ); // Defaults args fetch posts starting with the most recent
if ( $latest_post->have_posts() ) { 
        while ( $latest_post->have_posts() ) { 
            $latest_post->the_post(); ?>
            <div class="newsthumb">
                <a href="https://wordpress.stackexchange.com/questions/180858/<?php the_permalink(); ?>"><?php the_post_thumbnail(); ?></a>
            </div>
            <div class="newstitle">
                <a href="https://wordpress.stackexchange.com/questions/180858/<?php the_permalink(); ?>"><?php the_title(); ?></a>
            </div>
            <div class="postdate-category">
                <?php esportsheaven_posted_on(); ?> | <?php the_category(); ?>
            </div>
            <div class="newscontent">
                <?php the_excerpt(); ?>
            </div>
        <?php 
    }
    wp_reset_postdata();
}