page_a.php

<?php
/*
Template Name: Page A
*/
get_header();
?>

<div class="container">
    <h2>Latest Posts</h2>

    <div id="post-container">
        <?php
        $args = array(
            'post_type'      => 'post',
            'posts_per_page' => 3,
            'paged'          => 1,
        );

        $ajax_query = new WP_Query($args);

        if ($ajax_query->have_posts()) :
            while ($ajax_query->have_posts()) : $ajax_query->the_post(); ?>
                <div class="single-post">
                    <h3><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></h3>
                    <p><?php the_excerpt(); ?></p>
                </div>
            <?php endwhile;
            wp_reset_postdata();
        endif;
        ?>
    </div>

    <div class="carousel-controls">
        <button id="prev-btn" data-page="1">Previous</button>
        <button id="next-btn" data-page="1">Next</button>
    </div>

<?php get_footer(); ?>