The basics and ES6 Syntax, you can play with frameworks and libraries. I did that as a dot net dev. I did not really understand JS till I just reviewed the basics. After that the flow of the program made more sense.

You can start at javascript.info/ and read everything in order.
Or it is better to choose a course at udemy.com/topic/javascript/ and watch the course at the same time read javascript.info and take notes.
On youtube write: "playlist: javascript" and you will get a lot of practice.
At least that's how I studied JS.

freecodecamp is a great place to start as a beginner.

It’s old but this book is pure gold

As a code newbie, this might be the best book you'll ever read.

Lee Wynne ・ Mar 17 ・ 1 min read

#books #fundamentals #beginners #tutorial

Check out javascript30.com/. It is a 30 day JS course, each day you make a new will project.