Wordpress query a post by id

Wordpress get post id

// Retrieve the ID of the current item in the WordPress Loop.
get_the_ID()

Source: developer.wordpress.org

Wp_query post by category id

    $args=array(
    'posts_per_page' => 50, 
    'post_type' => 'my_custom_type'
    'cat' => $cat_id,
);
$wp_query = new WP_Query( $args );

Source: wordpress.stackexchange.com

Wordpress query a post by id

//WordPress: Query a specific post by its post type & ID
//For example, query Case Study with ID #12345

<?php query_posts('post_type=case_studies&p=12345'); ?>
  
/*To determine a post ID, refer to the
URL of the post while editing it:
http://localhost...wp-admin/post.php?post=12345...*/

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