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Build websites and web apps, from the first tag to React.
Next.jsNewGeneral-purpose languages for apps, scripts and backends.
Get close to the machine: memory, chips and smart contracts.
Build apps for iPhone and Android.
Make your own games in Roblox, Unity and Godot.
Query, analyze and chart data, and put AI to work.
The command line and the tools every developer works with.
From arithmetic to trigonometry, worked out step by step.
Physics from forces to gravity, solved step by step.
Chemistry from atoms to the periodic table, built on interactive benches.
From the rules to tactics, checkmates and endgames.
Security from the first alert to a contained breach.
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Build full-stack apps with AI: chat, preview, and publish.C Fundamentals
Issued May 22, 2026
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