One of the biggest mistakes we make is having a similar password across multiple websites. This puts you at serious risk of an account breach if any one of your accounts are compromised. With that one password, that hacker could easily try to break in to other sites.

This is especially important with sites with extremely sensitive information, such as online banking. A good rule of thumb here is to make these passwords complex and completely different from any other password. As they say, better to be safe than sorry.

Can't remember all those different passwords? PCWorld's Alex Wawro suggests . All the passwords can be stored locally on your computer and then recalled on an as-needed basis, allowing for more complex logins.

"The perfect password is one you never write down--a unique string of letters, numbers, and symbols that not even you know until the moment you enter it," Wawro writes. Listen to him before it's too late.

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