https://www.pluralsight.com/courses/javascript-network-requests

Most javascript-based applications use APIs to retrieve data from and send data to a server. In this course, Network Requests in javascript, you’ll learn to use javascript to communicate with APIs. First, you’ll explore how to send HTTP requests and process the data returned. Next, you’ll discover security-related features such as CORS. Finally, you’ll learn how to use WebSockets for high-performance communication. When you’re finished with this course, you’ll have the skills and knowledge of javascript needed to work with APIs and network requests.