how to show top article?

WordPress doesn’t have functionality to display the most popular article. You’ll need a plugin. Or consider manually making the post Sticky:
https://www.wpbeginner.com/beginners-guide/how-to-make-sticky-posts-in-wordpress/

thanks
i want to write this function manual.then add it to functions file.

can you sent to me this code.
how to show Article From 3 month ago until Today according Most viewed

Why not use a plugin? There’s essentially no difference between that and code in functions.php

Besides, writing post popularity functionality is no small task. You should consider hiring someone for the task: https://jobs.wordpress.net

hi
this code show post 3 month ago until now according to number view ? or not?

<?php
$popularpost = new WP_Query(array(
‘posts_per_page’ => 10,
‘cat’ => ‘2’,
‘meta_key’ => ‘post_views_count’,
‘orderby’ => ‘meta_value_num’,
‘year’ => date(“Y”),
‘month’ => date(“m”)-3,
‘order’ => ‘DESC’
));

while ( $popularpost->have_posts() ) : $popularpost->the_post();
?>
<div class=”clear mod-content gray”>“><?php the_title();?><span class=”badge”><?php echo getPostViews(get_the_ID());?></span></div>
<?php endwhile;
?>

this code show post 3 month ago until now according to number view ? or not?