Knowledge and training for WordPress has traditionally been very decentralized. There’s the official documentation, the developer documentation, the support forums, WordPress.tv, and then the wide array of community blogs, tutorials, and YouTube videos. Resources like documentation and support forums exist to answer questions and explain features, but their purpose is not to teach a person what it means to use WordPress. That’s the goal of Learn WordPress, managed by the WordPress Training team and living at the easy-to-remember URL learn.wordpress.org.
