Codecademy (free tier) — interactive coding lessons

Codecademy’s free tier provides interactive, beginner‑level lessons across popular programming languages and web technologies, including step‑by‑step exercises and an online code editor. Anyone can sign up for a free account to access foundational units and practice projects; paid Pro upgrades add assessments and guided paths but the basic learning content remains available without charge. Use the Codecademy homepage to create an account and start introductory tracks in HTML/CSS, Python, JavaScript and more.