Which crypto to buy today?

It's tough to give specific advice since the crypto market is so volatile, but my general rule of thumb is to invest in cryptos that have a long-term vision and a real use case. For example, Ripple (XRP) is focused on providing fast and affordable cross-border payments, whereas Ethereum (ETH) is designed to be a global platform for decentralized applications. Of course, there are always risks associated with any investment, so do your own research before deciding which crypto to buy. Good luck!