The safest way to store cryptocurrency is to use a secure hardware wallet, such as the Ledger Nano S. These wallets provide an extra layer of security as they are stored offline, meaning your private keys are protected even if your computer is hacked or infected with malware. You can also set up a cold storage wallet, which is an offline storage solution that uses paper or USB drives to store your private keys and passwords. Additionally, you should always keep a backup of your private keys and passwords.