Javascript Topics:

• primitives data types
• variables, string, numbers, booleans, undefined, null, NaN
• arithmetic operators
• comparison operators
• logical operators
• conditional statements (if else, switch)
• functions, arguments, return statement, scope
• callbacks, higher order functions
• for loops, while, do while
• Arrays
  • declaration
  • accessing items
  • assignment
  • Array methods
  • 2D array
  • 3D array
  • forEach, map, reduce, filter callbacks
• Objects
  • difference from arrays
  • key value pair
  • accessing values
  • assigning values
  • methods
  • for in loop
  • this
• hoisting
• scopes
  • global
  • local scope
  • block scope
• closures
• lexical scoping
• Execution context
• strict mode
• solve problems faster by using objects
• recursion
• DOM manipulation
  • createElement
  • append
  • getElementById
  • querySelector
  • querySelectorAll
  • setAttribute
  • children methods
• event API, eventListener
• event bubbling
• event capturing
• style and attribute manipulation with DOM
• JSON
• using AJAX / XHR
• callback, callback hell
• asyncrnonous behavior in javascript
  • setTimeout
  • setInterval
• event loop
  • call stack
  • task/event queue
• WEB API
• promises
  • promise chaining
  • advantage over callbacks
• async, await
• fetch API
• axios
• CORS
• jQuery
• IIFE
• anonymous functions
• Sets, Map
• modules
• localStorage, cookie, sessionStorage
• ECMAScript, TC39
• polyfill
• tree shaking
• HTTP protocols
• Implementation of Stacks, Queues, Linked List, Trees (Binary Tree, Nary Tree), Graphs
• Traversing, reversing, mirror, and other operations for LinkedList, Trees, Graphs (1st, 2nd, 3rd level)

ES6 and others:

• var let const
• arrow functions
• template literals
• destructuring
• default params
• event loop
• promises, async, await, fetch, axios
• classes
• this
• inheritance, and prototype
• call apply bind
• getters
• setters
• generators
• yield
• BigInt
• Optional Chaining