Configure the TypeScript compiler to work with modules, understanding CommonJS and ES6 module systems, and how to use the --module, --outDir, and --rootDir options for efficient code compilation.

Mastering Express.js fundamentals, including basic routing and handling HTTP requests, to build scalable web applications and APIs. Key concepts covered include route paths, request methods, and utilizing the request and response objects to access and manipulate data. By applying these concepts, developers can build robust and efficient Express.js applications.

Unit testing with JUnit in Kotlin is essential for ensuring individual code components work as expected. JUnit is a popular testing framework that can be used seamlessly with Kotlin, providing a rich set of assert methods and ease of use, with Kotlin's interoperability with Java allowing for effortless integration. By following key concepts and best practices, developers can effectively write unit tests with JUnit in Kotlin.