HTML & CSS Fundamentals takes you from a blank page to a fully responsive website, one building block at a time. Start with HTML structure and semantics — the tags, elements, and document outline that give every page meaning for browsers, search engines, and screen readers alike. Move into CSS: selectors, specificity, color systems, and typography that turn plain markup into something readable and on-brand. Then master the box model, the single concept that explains how every element is sized and spaced, before leveling up to modern layout with Flexbox and CSS Grid — the tools professional developers reach for every day. Finish by tying it all together with responsive design: media queries, fluid units, and mobile-first thinking, culminating in a real page you build from scratch that looks great on any screen. No frameworks, no shortcuts — just the HTML and CSS fundamentals every front-end developer, designer, and web-curious builder needs to know.