Node

OOP concepts - DONE
    Class, Constructors, Inheritance/asbstract, Extendable, Methods, Typescript - DONE

Database:
    RDBMS:
        Queries , Joins, Normalization, Advantages, Disadvantages
        Mongo Queries, Replica set, Sharding, Advantages, Disadvantages
        Difference between mysql no sql
        online nosql services
        elastic search

NodeJS
    How node works - Done
    Event driven programming language - Done
    run time vs programming - programming Langulage - JS, Runtime which run js (node, browser )
    compiler or interpreter - Compiled(JIT - just in time) and interpreter language. (loop problem so JIT brought in)
    how compiler works, Code -> tokenize -> Syntax tree -> then run it
    Event loop  - Done - task queue -> call stack -> c++ apis -> task queue
    Event Loop (simple term) helps to js do non blocking io operations
    global objects such as process done
    JS hoisting -  lift to top fun() declarations then var declaration
    js closure - check for local, then parent, then global
    promise - done es6
    await and async- done es7
    ES6 and basic array functions - Done
    ecma scripts - to created for standardize JS
    webpack - for bundeling
    gulp/ Grunt - task runnner
    babel - to transpiling code to support browsers
    favorites NPM - chalk, express, node-schedule, nodemon
    REST - pattern for making apis, get, POST, PUT, DELETE
    TDD and unit testing
    JS protypes

Caching techiniques and tools
    Nodejs caching techiniques
    Redis or something