Check out a free preview of the full Scalable Modular Architecture for CSS (SMACSS) course:
The "CSS Modules" Lesson is part of the full, Scalable Modular Architecture for CSS (SMACSS) course featured in this preview video. Here's what you'd learn in this lesson:
Modules contain content and are the majority of the site. They are an interface each user will have to learn. Modules may require variations like size or color which leads to the creation of module variations.