What shoud a modern JavaScript developer know well ?

1. JavaScript Custom Events with PubSub.
2. Unit Testing Your JavaScript Applications is Essential
3. DOM (Document Object Model) and BOM (Browser Object Model)
4. ECMAScript 3 and 5
5. The Best JavaScript Front-end Frameworks You Should be Using
6. Preventing and Handling JavaScript Errors and Debugging Your Code.
7. JavaScript Objects in Detail
8. JavaScript Prototype in Plain, Detailed Language
9. JavaScript Variable Scope and Hoisting Explained
10. Understand JavaScript Closures With Ease
11. Understand JavaScript Callback (Higher-Order) Functions
12. Understand JavaScript’s “this” With Clarity, and Master It
13. JavaScript’s Apply, Call, and Bind Methods are Essential
14. Learn HTML5, CSS3, and Responsive WebSite Design
15. Object Oriented JavaScript (OOP in JavaScript)
16. Learn Node.js Completely and With Confidence Or Learn Meteor.js Properly.