Use a password manager such as LastPass or Password Safe to store all your various passwords for different online sites. These programs can also create new passwords for you and can automatically fill out login forms for you.
Finally, activate two-factor authentication for any services that support this security measure such as Battle.net, Dropbox, Evernote, Facebook, Gmail, Twitter, and Outlook.com. Two-factor authentication requires you to enter a second, shorter temporary password that is usually generated by a smartphone application or small key fob.
Many services that offer two-factor authentication allow you to set trusted PCs so that you only have to enter your credentials once on new PCs or browsers.
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