In todays world you need to remember so many passwords. You have a password for your PC, email, internet, various online sites etc.. The list can go on forever. And you can't use the same password for all of those, otherwise if a hacker gets your password, he would have access to all your information.
KeePass is a free password manager, which helps you to manage your passwords in a secure way. You can put all your passwords on a single database, which is locked with one master key or a key file. So you only need to remember one master key or select the key file to unlock the whole database. The database is encrypted using the best and most secure encryption algorithms.
Use KeePass to store all your passwords, with one master password.