What does WordPress.org do well? The best Content Management System on the planet. We run more than 3 Blog and all of them are run with the help of WordPress. The reason why we love WordPress over similar CMS is you can customize your site as per your needs. A lot of free Plugins and Themes available to make your site more and more beautiful.
What does WordPress.org not do well? WordPress is upgrading from the best to the best always. No issues with WordPress.
What do you wish you had known about WordPress.org before using? If you are looking for a fully free powerful Content Management System, you can opt for WordPress.