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How much JavaScript should I know in order to learn Node.js?

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Wroking in IT industry from last 15 years and and trained more than 5000+ Students. Conact ME

Basic JavaScript understanding is essential for learning Node.js.
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My teaching experience 12 years

Node is written in JavaScript, so you should start by learning JavaScript. This means understanding scopes, functions, closures, module patterns, classes, promises, and callbacks, as well as the capabilities of Strings, Numbers, Arrays, Objects, Sets, and Maps.
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Adobe Certified , Microsoft Certified Trainer with 9 years of experience

Node is written in JavaScript, so you should start by learning JavaScript. This means understanding scopes, functions, closures, module patterns, classes, promises, and callbacks, as well as the capabilities of Strings, Numbers, Arrays, Objects, Sets, and Maps.
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Go through JavaScript tutorials from w3schools.com site. They have good examples with description. Then learn some es6 and es7 syntax. You will be pro in JavaScript.
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To understand Javascript and OOP, should we learn C ,C++?

 
no, not necessary.
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JavaScript (Lightweight & loosely typed client-side Scripting Language which needs interpreter) is entirely different from Java (Programming Language which needs compilation)
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