In the blockchain, your wallet address uniquely represents your identity:-D
The most important thing is Protecting your key file ！
It's difficult for you to remember your thousands accounts
It is not recommended that you set all your account passwords to the same character, because once a website is compromised by hackers, you can use it to break through your other websites.
So you can manage your accounts by private key
Nas PassWord is based on Nebulas,all your info is encrypted by blockChain
We never store any of your info