To buy, sell, and store cryptocurrencies, you will first need to set up a cryptocurrency exchange account. Most reputable exchanges are well-regulated and require identification to comply with anti-money laundering laws. Once you create an account, you can then deposit funds with a fiat currency like USD, EUR, GBP, or JPY. You will be able to purchase different cryptocurrencies with your fiat money, and you can store them in a digital wallet. To sell them, you will need to move them back to the exchange and convert them back into the fiat currency of your choice.