Also, if the market is crashing, or having a heavy dip quickest way is to send from your nano s straight to cash app..once you sell....fiat is immediately ready in your cash app that can be instantly sent to your debit card.
This is probably the part where there's a good chance you could mess this up. Selling at heavy dips? It should be quite the opposite, you should be buying at dips because you're getting the coins at cheaper prices (though dollar-cost averaging should be a better strategy overall).