Of course, the safest way would be to purchase a hardware wallet (choose the company yourself), a hardware wallet, this is one of the safest ways to store cryptocurrencies. It acts as an information carrier, but instead of films and documents, it stores private keys. If it is possible to hack an account on the exchange, but this has happened, then such an option is excluded here. All operations with the wallet can be performed only after entering the PIN-code of 8 digits. Operations are confirmed by simultaneous pressing of buttons, which increases the protection against malware. Two-factor authentication system, which implies, in addition to the personal code, verification with a 24-word control phrase, which is generated randomly on the device itself. Thus, even if the Ledger Nano S is stolen or lost, an attacker will not be able to gain access to your funds (unless, of course, they get your passphrase).