Let's talk about the React Context API that React 16.3 added. An "old" API existed, but people avoid using it now since documentation recommends the new version. So what's great about React Context API?

Asynchronous JavaScript, which is JavaScript that uses callbacks, promises, and async/await, helps with functions that take time to return some value or to produce some result. This article gives a basic explanation of how callbacks, promises, and async/await work, and it also helps anyone who has struggled with unreadable callbacks.