Resource Centers are content curated by the O´Reilly editors. Containing lists of selected books, book chapters, videos, video clips. Resource Centers provides scaffolded learning approaches to key topics, with materials geared toward the Beginner, Intermediate, or Advanced learner. They´re designed by O´Reilly editors to provide a structured deep dive into a key topic.
You will find them 1) on the main toolbar. From there you can browse the available topics.
The Resource Center content for each topic is divided into 3 sections: Start your learning, Dig a little deeper and Become an expert.