https://github.com/puneetvashisht/CDB21IN002

- NodeJS -- Server side code.. JS Engine
- NPM - Node Package Manager .. playstore to NodeJS.. install JS libraries
- npm i -g http-server
- npm i -g json-server
- React Application using create-react-app
    - Props: passing data to components (not to be changed)
    - State: data that belongs to component (changeable)
    - Functional & Class syntax (pluging Simple extensions for React)
    - componentDidMount: lifecycle method invoked automatically as the component is mounted.. use it for initialization.
    - fetch() -- promise based method for AJAX
- Server side communication using fetch
    - DELETE, POST
    - POST: read values from textbox: React.createRef();
- Virtual DOM using Clock -- React peformance.
- Parent-Child communication using Dropdown .. pass function as props.
- Single Page Application -- closer to mobile view.. just sending/recieving data.
- React-dom-router / any other library: https://reactrouter.com/
- Link, Routes, Switches -- Parameterized Route


Node
    JS Core Libraries: FS, Http
    Extension libraries through NPM (eg. express, mongodb, mongoose, colors, cors....)
    Asynchronous methods by default.. (callbacks, promises, async/await)

ExpressJS
    Routes
    Error handlers (to handle negative cases/scenarios)
    Controllers (Handling http stuff, dealing with request/response)
    Routes (Configuration of Http methods and routes available)
    Repos (DB Access... (optional))