In the world of internet you will find such resources which will help you in learning JavaScript, well. I am going to tell you about some such resources which I have personally used.

Udemy JavaScript in Action JavaScript Projects
In this Javascript course you will learn how to make a AJAX calls, you will get 35 pages PDF where you will be guided on how to do coding

JavaScript: The Definitive Guide: Master the World's Most-Used Programming Language
This is a book where fundamentals of JavaScript are explained very well

If you want to know more about these two resources, you can ask me in the comment section