Web Development Basics: FREE HTML, CSS, JS THEORY

Explore the essentials of web development, including front end and back end roles, and how HTML, CSS, and JavaScript craft user interfaces and interactive experiences.

Master HTML, CSS, and JavaScript to structure, style, and empower interactive web pages. Emphasize accessibility, performance, and security to shape inclusive, efficient online experiences.

Explore the browser's developer tools to inspect and edit HTML and CSS in real time, debug JavaScript with the console, and monitor resources and network activity.

Learn HTML fundamentals by exploring elements and tags like p, a, img, lists, inputs, and video, and understand the page structure with doctype, html, head, and body.

Explore the two HTML element types—block and inline—by using devtools to observe their boxes: blocks fill width, while inline elements fit content, illustrated by p and button elements.

Explore how the browser renders HTML through style, layout, paint, and compositing, and how CSS changes rendering. Review HTML tags, attributes, and basic structure that influence default rendering.

Explore the document object model, a tree-like representation of HTML, enabling JavaScript to access and manipulate elements dynamically with methods like getElementById and querySelector.

Explore the CSS box model by examining width, padding, border, and margin as an element's layered box. Understand how each layer affects size, spacing, and layout on the page.

Explore the fundamentals of CSS and the role of selectors in shaping web pages. Learn about type, class, id, attribute selectors, and the selector and declaration blocks that drive styling.

Explore the three methods to integrate CSS in HTML—inline styles, embedded CSS, and linked styles—showing how to apply color, background, and font family across pages.

Explore CSS selectors, the patterns that target HTML elements for precise styling. Learn element, class, id, attribute, descendant, child, and adjacent sibling selectors with practical examples.

Explore CSS data types, including keywords, strings, integers and real numbers, resource locators, and colors in RGB, RGBA, hex, and HSL formats, and learn how properties accept specific values.

Learn how responsive design makes websites accessible and engaging across devices by using fluid grids, flexible images, and media queries, while prioritizing mobile-first experiences, performance, and search engine optimization.

Explore the essence and evolution of JavaScript in modern web development, from front end interactivity to back end capabilities and frameworks like React, Vue, and Node.js.

Learn two ways to integrate JavaScript into a web page: embedded script in HTML and an external index.js linked via the src attribute, emphasizing maintainability and code organization.

Learn how JavaScript strict mode enforces stricter parsing and error handling, eliminates silent errors, and improves code security by enabling 'use strict' at the start of your file.

Explore JavaScript variables with var, let, and const. Understand JavaScript is loosely typed; var is hoisted and global or function-scoped, let is block-scoped, and const cannot be reassigned.

Explore how JavaScript variables work in a loosely typed language, covering var, let, and const. Learn scope, hoisting, and when to use let for mutable values and const for bindings.

Explore JavaScript conditional statements, including if, else, else if, and nested ifs, to control flow. Use logical operators and the ternary operator to craft concise, efficient decision logic.

Explore the fundamentals of JavaScript functions, including named, anonymous, and arrow functions, how to define, invoke, pass parameters, and return results to build modular, reusable code.

Learn how event listeners in JavaScript make web pages interactive by responding to clicks and other events on HTML elements using addEventListener and callbacks.

Explore how JavaScript objects organize data with properties and methods, accessed via dot notation, using a car example with color, make, model, start, stop, and drive.