Even with the techniques above, when you're managing numerous accounts and using more than one device, it's easy to lose track of some of your login information. If you're still having trouble remembering all your passwords, you have a few options:

Use a password manager. A password manager is an app or web browser add-on that securely stores your logins and passwords. You can customize it to autofill your passwords and some apps may even generate (and remember) strong passwords for you, says US-CERT. Some password managers also have an option that allows you to set a master password that helps protect access to all your other passwords and login information.
Set password recovery options. Many websites have a password recovery option so you never get locked out of your account. Simply enter an alternative email or your mobile phone number so you can receive an automated reset link in the event you're locked out of your account.
Go analog. You can still write down your passwords — just keep your list in a safe place away from your computer, US-CERT says. Don't ever store them in a file on your computer or any devices.

Once you've found a system for choosing strong passwords — and remembering them — you'll be able to help minimize the chances of your data being compromised.