Just remember only one password!
Nevertheless, you have secure passwords for all purposes. Starting from a master password and a key (purpose or service, for example Amazon, eBay, etc.) the secure cryptographic method (SHA1) generates secure passwords for any purpose.
But you don’t have to remember the password. You can regenerate the password at any time by entering the master password and the key through this app.
Of course the prerequisite is that the chosen master password is secure and complex enough and that you keep it a secret.