You should always use a different password for everything you need a password for.
Just think of all of the things you may need a password for. That is a lot of password.
Step in, Roboform.
You only need one master password, which gives you access to the Roboform platform and an app that you can use on your phone to access all of your passwords, usernames and any notes you choose to make (known as Safenotes).
Everything is secured with military-grade encryption.
The cost? Around $20 per year.
Imagine never having to freak out about a lost password ever again, for so little money.