Web Fundamentals: CSS - The Basics

A beginner-friendly introduction to CSS covering the core building blocks of web styling. Topics include the five basic selector types (universal, class, ID, type, attribute), selector grouping and combining, CSS units (absolute vs. relative: px, %, vw, vh, em, rem, ch, ex), value types, shorthand properties, CSS custom properties (variables) with fallbacks and nesting, the calc() function for dynamic layouts, and the five CSS positioning types (static, absolute, fixed, relative, sticky).