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Wallets, keys, gas, exchanges — the real plumbing
Start here. You'll learn what a private key actually is (no hand-waving), how transactions become blocks, what gas pays for, and why CEX vs DEX is a tradeoff, not a moral question. Every concept has code you can run.
Your 'wallet' doesn't hold coins. It holds a single number — a private key — that signs messages to prove you control an address.
Let's actually compute the address. Takes the public key, hashes it with keccak256, keeps the last 20 bytes.
A transaction isn't magic. It's a signed message saying 'I, owner of this private key, want to send X to Y and burn this much gas.'
Kraken and Uniswap both let you trade BTC for USDC. They work entirely differently.