How to preview posts from specific categories only?

Thanks alot @ajay that helpes a lot

and for you @releasejim

if ( function_exists( 'get_tptn_pop_posts' ) ) {

	$settings = array(
		'daily' => TRUE,
		'daily_range' => 30,
		'limit' => 20,
		'strict_limit' => FALSE

	);

	$topposts = get_tptn_pop_posts( $settings ); // Array of posts
	
	$topposts = wp_list_pluck( (array) $topposts, 'postnumber' );
	
	$args = array(
		'post__in' => $topposts,
		'orderby' => 'post__in',
		'posts_per_page' => 7,
		'ignore_sticky_posts' => 1,
                'category_name' => 'you-category-name' // you can find you category name in posts/category and 'slug'
	);
	
	$my_query = new WP_Query( $args );
	if ( $my_query->have_posts() ) {
		while ( $my_query->have_posts() ) {
			$my_query->the_post();
			echo '<a href="' . get_permalink( get_the_ID() ) . '">';
			the_title();
			echo '</a>';
			wp_reset_postdata();
		}
	} else {
	}
	wp_reset_query();
	
}