W3Schools Online Web Tutorials

Free interactive web development tutorials, references, and certifications.

W3Schools provides a comprehensive library of free, browser‑based tutorials, reference guides, and hands‑on exercises covering HTML, CSS, JavaScript, Python, SQL, and many other web and programming languages. Learners can practice code in an online editor, earn certificates, and access quizzes, quizzes, and challenges—all designed to help beginners and professionals master web development skills at their own pace.