The safest way to store your crypto currencies is via storing them in a cold wallet.
cold wallet is a wallet that is not connected to the internet and therefore stands a far lesser risk of being compromised. These wallets can also be referred to as offline wallets or hardware wallets. It can be in a shape resembling a Usb, like the “Ledger Nano” wallets or in other hard-drive shape, like the “Trezor” wallets
These wallets store a user’s address and private key on something that is not connected to the internet and typically come with software that works in parallel so that the user can view their portfolio without putting their private key at risk.