Getting posts of a specifc category

Hello,

You should use the get_posts function to get all posts from the categories you want:

<?php
   $args = array('category' => '9,7' );
   $myposts = get_posts( $args );
   foreach( $myposts as $post ) : ?>
   <?php the_title(); ?>
<?php endforeach; ?>

For more information on how get_posts work, check out this page: https://codex.www.ads-software.com/Template_Tags/get_posts

alternatively, rewrite your code to use a ‘while’ loop:

<?php
$args = array( array('category__and' => array(9, 7)) );
$acc_post = new WP_Query( $args );

if( $acc_post->have_posts() ) while( $acc_post->have_posts() ) : $acc_post->the_post(); ?>

<?php the_title(); ?>

<?php endwhile; ?>

https://codex.www.ads-software.com/Class_Reference/WP_Query