Uniswap is a decentralized exchange that lets users swap cryptocurrencies directly from a wallet. To use it, first install a compatible wallet like MetaMask and fund it with ETH for swaps and gas fees. Visit the official Uniswap website and connect your wallet securely. Choose the token you want to trade from and the token you want to receive, using verified contract addresses. Review the exchange rate, slippage, and network fees carefully. Confirm the transaction in your wallet and wait for blockchain confirmation. Always start small, double-check links, and protect your recovery phrase to reduce mistakes and avoid beginner risks.