To add crypto to a hardware wallet, you can connect your device to your computer or phone. Some devices plug into your computer with a USB cord others connect wirelessly via QR code or WiFi. Most accompanying wallet software has tools to purchase crypto directly, or you can send crypto to the wallet address from another wallet or exchange. It is subjective what is the best way to transfer crypto between exchanges and depends on the individuals needs, exchanges, and prevailing market conditions. However, a commonly adopted approach is to use well-known, highly liquid crypto assets. Cryptocurrencies such as Bitcoin BTC, Ethereum ETH, and Binance Coin BNB are frequently used for such transfers because they are widely accepted across almost all exchanges. Because of the irreversible nature of cryptocurrency protocols, transactions can't be canceled or reversed once initiated. If you sent cryptocurrency to the wrong external crypto address, please contact the recipient and ask for their cooperation in returning it. If you don’t know the owner of the address, there are no actions you can take to get your crypto returned.