To buy, sell, and trade cryptocurrency, you will need to open an account on a cryptocurrency exchange. Once you’ve opened an account, you can deposit funds from your bank account or credit card into it. From there, you will be able to purchase cryptocurrencies from the exchange. To sell your coins, you would need to place a sell order and provide the exchange with your wallet address for the proceeds. To trade, you would need to place buy and sell orders on the exchange in order to execute trades.