Help with home.php

Hey, I’m currently using a free wordpress theme Seller, and I want to change the home page’s display function. Here is the original code:

<main id="main" class="site-main" role="main">
		<?php $count = 0; ?>
		<?php if ( have_posts() ) : ?>

			<?php /* Start the Loop */ ?>
			<?php while ( have_posts() ) : the_post(); ?>

				<?php
					/* Include the Post-Format-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 Format name) and that will be used instead.
					 */
					if($count == 0)
						echo "<div class='row'>" ;
					elseif($count%4 == 0)
						echo "</div><!--.row--><div class='row'>";

					if (isset($option_setting['logo'])) :
						get_template_part( 'content', 'grid3' );
					else :
						get_template_part( 'defaults/content', 'grid3-d' );
					endif;

					$count++;
				?>
			<?php endwhile; ?>
			<?php echo "</div><!--.row-->"; ?>

			<?php seller_pagination(); ?>

		<?php else : ?>

			<?php get_template_part( 'content', 'none' ); ?>

		<?php endif; ?>

		</main>

Now, I am trying to change this function so that instead of displaying the recent posts, I want to make something like “editor’s choice” or “recommended reading”, and those displays are going to be pages, and static, not posts. I understand the original code and which part to change, but not sure to change it to what. I have read some articles about page_id, is this the right way to approach? Any idea would be very helpful!