Silly question. In practice, how do you sell/buy BTC on an exchange, if it is stored in a cold wallet?
I might be dumb, explain to me like if I was a kid. How do you go about trading on an exchange if your BTC is safe on cold storage? Is there a dumbed down tutorial somewhere for beginners (say with Binance/Coinbase, and a Ledger/Trezor/ColdCard)? Also, do you always need a computer, or can you use a cold wallet with an iPhone?