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

wordpress-insert-post.php

<?php
// Insert post programmatically
$new_post = array(
  'post_title' => 'My new post',
  'post_content' => 'Content to insert.',
  'post_status' => 'publish'
);

$post_id = wp_insert_post( $new_post );

if( $post_id ){
  echo "Post inserted successfully with the post ID of ".$post_id;
} else {
  echo "Error, post not inserted";
}