Insert a custom post type programmatically in WordPress https://smartwp.com/wordpress-insert-post-programmatically/

wordpress-insert-custom-post.php

<?php
// Insert custom post programmatically
$new_post = array(
  'post_title' => 'My new example post',
  'post_content' => 'My new content!',
  'post_status' => 'public',
  'post_type' => 'my_post_type'
);

$post_id = wp_insert_post( $new_post );

if( $post_id ){
  // Update custom field on the new post
  update_post_meta( $post_id, 'my_custom_field', 'Hello!' );
} else {
  echo "Error, post not inserted";
}