In a digital world it's important to have our passwords in a secure place.
You can use the old method(wirte down your password on piece of papper), or you can use some program in your computer to encrypt them for you.
1.KeePass
KeePass is a free open source password manager.The program helps you to mage password in a secure way, by encrypting them and with a master key you can onlock all database .
2.LastPass
LastPass is a google extension that save for you your passwords from sites.They encrypt as well the passwords.
In lastPass you have the free version and the paid version(you only have a trial of the free version).
3.1Password
1Password is a password manager that encrypt your passwords too.
1Password is similar to lastPass payment method.
In my view if you can afford to pay to secure is better but the keePass it's an interesting alternative, i have been using it for 1 year now.