Crypto and Modern Finance — Bitcoin, tokens, wallets, and keys explained plainly.
A cryptocurrency is a digital asset secured by cryptography, usually tracked on a blockchain rather than issued by a bank.
Private key: A secret code that proves ownership and authorizes transactions. Anyone who has it controls the funds, so it must never be shared.
With self custody there is no bank to call. Lose your key or seed phrase and the funds are usually gone for good. Confirmed transactions are also generally irreversible.
Stablecoin: A cryptocurrency designed to hold a steady value, often pegged to a currency like the dollar, to avoid wild price swings.
A hot wallet is online and convenient but more exposed. A cold wallet stays offline and is more secure.
11 practice questions with explanations. Free, and no account is needed to start.