express app --- for create default express framework strutcure

html: is the shortcut for get html format page

├── app.js ├── bin │ └── www ├── package.json ├── public │ ├── images │ ├── javascripts │ └── stylesheets │ └── style.css ├── routes │ ├── index.js │ └── users.js └── views ├── error.pug ├── index.pug └── layout.pug

==> What is the difference between cookies and cache? Although cookies and cache are two ways to store data on client's machine, but there are difference between cache and cookies and they serve different purposes. Cookie is used to store information to track different characteristics related to user, while cache is used to make the loading of web pages faster.

==> ./ means the current directory

../ means the parent of the current directory, not the root directory

/ is the root directory