Get LastPass
Use a Password Manager
A Password Manager is software that will securely keep all your passwords in an encrypted database. This way you only need to remember one master password. Most will generate random passwords for you and help make sure each one is unique. Most also have plugins for your browser that will automatically fill passwords for you. You can also share logins with family and co-workers without letting them know your password.
These days most browsers will keep passwords for you but for added functionality like password generator, secure notes, sharing, and even dark web monitoring, try one of the popular services like LastPass.
I use LastPass, it has everything including two-factor authentication.