Buying cryptocurrency: You can buy or sell cryptocurrency on exchanges, such as Coinbase, Binance, Kraken and Bitstamp. These exchanges allow you to deposit funds (typically, USD, EUR or GBP) in exchange for cryptocurrency, such as Bitcoin or Ethereum.
Selling cryptocurrency: You can sell cryptocurrency on the same exchanges that you use to buy cryptocurrency. Again, this is typically done using USD, EUR or GBP.
Storing cryptocurrency: Cryptocurrency needs to be stored in a “wallet”, which is essentially a digital bank account. There are a variety of wallets available, but it’s important to pick a secure wallet for your coins. It’s not recommended to store coins on an exchange as there have been many cases of exchanges getting hacked and coins being stolen.