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Microsoft: Learn JavaScript programming language for free with our new course Programmers keen on building browser applications can take advantage of Microsoft's free JavaScript video course.

Instead, start with a beginner-friendly course on Udemy. A wide range of beginner-friendly JavaScript courses are available on Udemy.

Eloquent JavaScript is also good, and free. The second edition talks a lot more about the browser, which is good, since that's where most of your code will run.