The cryptocurrency account password & private key and ZOS Wallet documents & password shall always be stored locally. Don't put them online, or share with anyone. They cannot be retrieved once lost.
When the account is created, the system automatically has the Owner authority and Active authority with three pairs of key: Owner Key, Active Key and Memo Key.
Owner Key: it is the highest authority, but it is not universal. It can only manage other permissions of the account.
Active Key: it is used to manage the transfer and small change permissions.
Memo Key: the memo information attached to the transaction is transmitted after encrypted by public memo key, and only a corresponding private key of the public key can decrypt it. The memo information is managed by a single public/private key pair, which allows you to hand over read-only permissions safely to a third party without the risk of losing assets controls.
Each key pair consists of a public key and a private key, similar to the account number and password of a Alipay account. To Generate the public key means to generate a transaction address(payment code), and to generate the private key means to sign a transaction(payment password). The public key is kind of an address, open to the public as the account identity. The private key as the most critical part of account security is not stored on the network, but shall be kept by users themselves(saved in screenshot photo or local file). If you lose the private key, you can never get your account and assets back.