Front End Badassery with Sass

This document introduces Sass as a solution for the pain points of CSS like lack of variables, nesting, and repetition. It highlights Sass' features like variables, nesting, mixins, extends, and color/math functions that make front-end development easier. The document provides tips for using Sass such as limiting nesting to 2 levels, using imports to avoid extra HTTP requests, separating mixins into a library, and thinking in modules to build a Sass partial library. It recommends learning more about Sass through documentation and other resources and introduces related preprocessing tools like LESS and Stylus.