What books/courses to choose on JS for A/B testing in google tag manager?

Question

JavaScript

Good afternoon!
I am a complete noob in JS (in JS I don’t know how from the word at all). The task was to conduct an AB test of several pages of the site.
When studying the literature, questions arose regarding the sufficiency / redundancy of the material presented.
The request to prompt the specialized literature on JS that the volume of the information necessary for AB testing was "parsed". Because of the abundance of information and humanitarian thinking, confusion arises.

Answer 1

Do you need JS for AB tests? This is what scripts do.
In any case, here's to you:

• Nodeschool . Great online tutorial with practice.
  
• W3School . No less decent tutorial with a sandbox and certificates.