This module introduces us to the field of web development and teaches us the basic nuts and bolts.

Zero to Hero in Front-end Web Development

If you are new to web development, this module is designed to provide a structured approach to learning the basics of web development. It will provide the foundational knowledge required to learn web development and understand the different technologies available in this field. Moreover, it comprehensively covers the foundations of web development, from the basics of networks to the principles of front-end web development with HTML, CSS, and JavaScript.

After completing this module, you will have a solid foundation in web development and be comfortable learning any web technology.

Web Development: A Primer

# What do backend engineers do?
Backend engineers program servers to process user requests and respond with the requested resource correctly. They also write code to process and store user data.

## Efficient storage and delivery of information 
Data that pertains to a website has to be stored in a database and delivered upon request. Consider Amazon's database of items; if their database query system becomes inefficient at any point, they'll lose customers.

## Customized user experience
Servers often store and use information about clients to provide a tailored user experience. For example, many sites store credit card details so that the information doesn't have to be entered again. 

## Controlled access to content
Backend programming entails restricting access to information appropriately. For example, in a ride-hailing application such as Uber, one user should not be able to view another's car travel history.

## Store session/state information
Backend engineers also do user session handling, i.e., a string is associated with each user that visits the website, and data associated with the string such as their emails or order history are saved and displayed when the user visits again. Another example is saving the state of a simple game so that the user can go to the site again and carry on from where they left it.

## Notifications 
Servers can be programmed to send general or user-specific notifications through the website itself or via email, SMS, instant messaging, video conversations, or other communications services.

A few examples include:
- Facebook and Twitter send emails and SMS messages to notify you of new communications.
- Amazon regularly sends product emails that suggest products similar to those already bought or viewed that you might be interested in.
- A web server might send warning messages to site administrators, alerting them to low memory on the server or suspicious user activity.


## Data analysis
A website may collect a lot of data about users: what they search for, what they buy, what they recommend, how long they stay on each page. Server-side programming can be used to refine responses based on an analysis of this data.

For example, Amazon and Google both advertise products based on previous searches (and purchases).

In this lesson, we will discuss what are the basic functionalities of back-end engineers.

Back-end programming

What do backend