CSS is and will always be an important part of the Web. Making it simple, well-structured, and with a flexible markup leads to a good architecture. In this chapter, we learned about the most popular concept to write modular CSS. Along with that, we checked the latest trends in CSS preprocessing, the available tools, and their features.

Node.js is fast and is very often used as a REST API. In the next chapter, we will see how to write a REST API and what the best practices in this direction are.