display content on certain pages wordpress

We can check which page we are on and then we can add the content we want to show, Here

if(have_posts()):


        while(have_posts()):the_post();
        ?>
            <article class="post page">
                    <h2><?php the_title();  ?></h2>
                        <small>
                            <?php
                                if(is_page(17)){
                                    echo "Displaying by checking which page we are on";
                                }
                            ?>
                        </small>
                    <p>
                        <?php the_content();  ?>
                    </p>
            </article>
        <?php
        endwhile;
    
    else :


        echo "No Posts Found";


    endif;

Here we are checking if page id is 17 then display certain text we can check for multiple pages like

if(is_page(17) && is_page(16)){
       echo "Displaying by checking which page we are on";
}

Instead of id you can use slug as well

<?php
     if(is_page('about_us') && is_page('contact_us')){
           echo "Displaying by checking which page we are on";
     }
?>

Hope this helped