Following is a list of core JavaScript concepts:

• History
  • Developed in 1995 by Brendan Eich
  • Initially named as LiveScript
  • Also known as ECMAScript
  • JS has no concept of input or output
  • It runs in an hosted environment like Node Server or Browsers
• Overview
  • JS is a multi-paradigm, dynamic language
  • Syntax is similar to Java and C languages
  • It supports object oriented approach using objects prototypes instead of classes
  • It also supports functional programming
• Types
  • Number
  • String
  • Boolean
  • Symbol
  • Object
    • Function
      • Inner Functions
    • Array
    • Date
    • RegExp
  • Null
  • Undefined
• Variables
  • Let
  • Const
  • Var
• Operators
  • Numberic
  • Plus (+)
  • Comparison
  • Bitwise
• Control Structures
  • if-else
  • while loop
  • do-while loop
  • for loop
  • for-of loop
  • for-in loop
  • switch

References:

• https://developer.mozilla.org/en-US/docs/Learn
• https://developer.mozilla.org/en-US/docs/Web/JavaScript/A_re-introduction_to_JavaScript