Learn & tools
Learn the basics.
Find a useful tool.
Visual computer-security lessons, interactive blockchain and machine learning experiments, and practical tools for everyday tasks. Choose a place to start.
Visual experiments
Computer security
What stops a stolen password, a fake sign-in page or a stolen session? Start with account security, then explore the existing lessons on hashes, keys, recovery and shared control. See each protection alongside its limits.
Explore computer securityInteractive lessons
Choose a learning subject
Start with hashes and wallets, then explore liquidity pools, Aave lending, Chainlink price feeds and Polymarket. Explore staking and vaults with returns, losses and withdrawal constraints together. Or open the machine learning track: decision trees, CNNs, reinforcement learning and language-model errors, with visual experiments and checks along the way.
View all subjectsPractical utilities
Useful everyday tools
Create QR codes, check Ethereum addresses, and convert text. Small, useful tools that are free, ad-free, and tracker-free.
Browse the toolsEducational demonstrations
Explore how systems work
Inspect a fictional agent workflow, try a signing scenario, or follow connections between the work and lessons.