Just like passwords, OTP codes or PINs, private key wallets must also be protected. Because if the codes are leaked to irresponsible people, your crypto assets might disappear. Then, how to keep the private key? First, never share your private key wallet with anyone, including individuals claiming to be from crypto companies, whether they are crypto exchanges, wallets or the issuer of the currency itself. Second, write down the private key on a piece of paper (try not to use it on a cellphone, computer or other electronic device), then store the paper carefully, for example, in a safe, under the bed or any other place that you think is safe.