Free Quiz Courses

Short courses built entirely out of questions. Every answer comes with an explanation, so you learn whether you get it right or wrong. Free, no signup, progress saved in your browser.

• HTML
  Test your HTML knowledge: document structure, semantic tags, text and links, forms, images and media, tables, and accessibility.
  5 chapters, 50 questions
• CSS
  Test your CSS knowledge: selectors and specificity, the box model, positioning, Flexbox, Grid, responsive design, and modern CSS features.
  5 chapters, 50 questions
• Tailwind CSS
  Test your Tailwind CSS knowledge: the utility-first approach, layout and spacing, typography, responsive design, states, and customization.
  5 chapters, 50 questions
• JavaScript
  Test and sharpen your JavaScript knowledge: values and types, closures, objects, the event loop, promises, this, prototypes, and modules.
  5 chapters, 50 questions
• TypeScript
  Test your TypeScript knowledge: type annotations and inference, interfaces vs types, unions, generics, narrowing, and the compiler.
  5 chapters, 50 questions
• React
  Test your React knowledge: components and JSX, props and state, hooks, events, forms, conditional rendering, lists and keys.
  5 chapters, 50 questions
• Node.js
  Test your Node.js knowledge: the runtime, modules and npm, the file system, environment variables, the event loop, and building servers.
  5 chapters, 50 questions
• Git & GitHub
  Test your Git knowledge: commits and the staging area, branching and merging, rebase, undoing mistakes, remotes, and GitHub workflows.
  5 chapters, 50 questions
• The Terminal
  Test your command line knowledge: navigating the filesystem, working with files, permissions, pipes and redirection, and processes.
  5 chapters, 50 questions
• SQL & Databases
  Test your database knowledge: tables and data types, SELECT queries, joins, keys and constraints, and how relational databases work.
  5 chapters, 50 questions
• HTTP
  Learn how the web talks: requests and responses, methods, status codes, headers, caching, cookies, CORS, HTTPS, and HTTP/1.1 vs 2 vs 3.
  5 chapters, 50 questions
• Browser Internals
  How browsers actually work: the rendering pipeline, the JavaScript engine, resource loading, storage, the security model, and performance.
  5 chapters, 50 questions