In this section, we'll put Express.js in the spotlight, making it the star of our journey. Get ready to:

• Discover how even the simplest water pipelines can illuminate fundamental concepts;
• Discover how a 'postman' can be your secret ally in testing your apps and more;
• Acquaint yourself with the term HTTP and realize you use it daily;
• Get a fresh perspective on visiting the library and how it relates to web communication;
• Witness the magical transformation of your computer into a responsive server powerhouse.

Discover What Awaits

• Discover the Express.js Framework;
• Learn How to Set Up an Express.js App;
• Understand the Basics of HTTP Requests;
• Create Custom Routes for Your Application;
• Explore Built-in and Custom Middleware.

It's crucial to emphasize that this section lays the groundwork, arming you with vital knowledge to breathe life into your app ideas. Think of it as the launchpad propelling us into the next section, where we'll dive headfirst into building APIs from scratch.