PHP

get_posts category

$defaults_param = array(
				'numberposts'      	=> -1,
				'post_type'        	=> 'post',
				'category' 			=> 40 ,
				'suppress_filters'	=> false
			);
$get_featured_post = get_posts($defaults_param);

PHP Display Posts by Category in WordPress

$espbc = get_sub_field('add_posts_by_category');
        
        $defaults_param = array(
          //'numberposts'      	=> -1,
          'post_type'        	=> 'post',
          'category' 			    => $espbc,
          'posts_per_page' 			    => 6,
          'suppress_filters'	=> false
        );
        $catPost = get_posts($defaults_param);

Get wordpress posts by category name..!

<?php query_posts('category_name=CATEGORYNAME&showposts=5');

while (have_posts()) : the_post(); ?>

the_title();   // To display the title of all posts that have category name selected 

the_content();   // To display the content of all posts that have category name selected 


<?php endwhile; ?>