Welcome to Lesson 2 of "Amplify Your Coding: Mastering Web Apps with CodeIgniter 3," where we lay the foundational bricks of setting up and understanding the intricacies of a CodeIgniter 3 development environment. This lesson is integral as it transforms your system into a fortress of web development, allowing you to build, test, and iterate your web applications with precision and ease. Here, you will learn the practical steps of installing CodeIgniter 3, comprehending its directory structure, and configuring settings that align with your development preferences and requirements.

The journey begins with "Installing CodeIgniter 3 and Setting Up Development Environment," ensuring that you start on the right foot with a successful setup. You will walk through the installation process, system requirements, and best practices for configuring your local development environment. This foundation is crucial for a smooth operation in CodeIgniter 3 and sets the tone for your developmental adventures.

Next, "Exploring CodeIgniter 3 Directory Structure" will familiarize you with the composition and function of the files and directories within CodeIgniter 3. Like a well-organized toolbox, understanding where and why each tool lies will enhance your efficiency in web app development. "Understanding Configuration Files" will follow suit, granting you the know-how to tailor your application by tweaking the global settings. These configurations make the nature of CodeIgniter 3 adaptable to your project's needs.

Then, we will delve into "Database Configuration in CodeIgniter 3," a core aspect that bridges your application with databases. You will learn how to configure database connections, allowing your applications to interact with data effortlessly. Following closely, you'll uncover how to beautify and streamline access to your web applications by "Enabling Pretty URLs," enhancing usability and SEO. Finally, "Setting Up Libraries, Helpers, and Plugins" will expand your toolset within CodeIgniter 3, enabling you to add functionality swiftly and simplify your coding tasks.

By the end of this lesson, you will not only have a fully operational CodeIgniter 3 environment but also the comprehensive knowledge to navigate and refine it to perfection. Embrace the learning, for this is where we turn the key igniting the engine of your web development capabilities.