You cannot remember all those passwords of yours? Use a password manager, and you only ever have to remember one!
Applying our 6 rules for a secure password, you should never use the same password in all different places. However that’s not quite so easy if you consider all the places for which you need a password nowadays.
With the help of a password manager, you can store all your passwords in encrypted form and thus securely. You will then only have to remember just the one password – for your password manager itself.
And it is not just passwords that password managers can store: If required, integrated tools will fill in all input fields automatically, or will create some highly complex passwords which you will never have to remember again.