The thoroughness of Tom Johnson's free Documenting API's course on OpenAPI 3.0 and Swagger UI

While researching information for my job about the Swagger UI and how it can be used for testing, I came across this free course, called Documenting APIs: A guide for technical writers and engineers at https://idratherbewriting.com/learnapidoc/docapis_overview.html written by Tom Johnson, a technical writer based in Seattle who works for Google. The course looks intense, containing 17 chapters talking about Introduction to REST APIs, using APIs like a developer, Documenting API endpoints, the Open API spec, Testing API docs, Publishing API docs, and more.From the Course Introduction: "You’ll first learn about API documentation by using a simple weather API to put a weather forecast on your site. [...] As you use the API, you’ll learn about endpoints, parameters, data types, authentication, curl, JSON, the command line, Chrome’s Developer Console, JavaScript, and more. The idea is that rather than learning about these concepts independent of any context, you learn them by immersing…