Here are 10 quick facts about cryptocurrencies: 1. Bitcoin: Created in 2009, it was the first cryptocurrency. 2. Blockchain: Cryptos operate on blockchain technology. 3. Decentralization: Most have no central authority. 4. Mining: Many are produced by mining. 5. Ethereum: Supports smart contracts and decentralized apps. 6. Volatility: Crypto prices are highly volatile. 7. Wallets: Digital wallets store cryptocurrency securely. 8. Altcoins: All non-Bitcoin cryptos are "altcoins." 9. NFTs: Non-fungible tokens represent unique assets. 10. Web3: Crypto supports the decentralized Web3 movement.