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Use a Password Manager
Password managers help to manage the mess of creating strong, unique passwords for multiple online accounts. This helps you get around password-reuse (you know you do it!) and because they integrate directly with Web browsers, it will automatically save and fill website login forms and securely organize your life online.
GMail two-step authentication
We all use GMail and some of us re-use a password from another online account to lock into GMail. Not good. It's important to turn on Google's two-step verification to make sure no one is logging into your e-mail account without your knowledge. It's a two-factor authentication scheme that sends text-messages to your phone to verify that you are indeed trying to log into your GMail. It takes a about 10-minutes to set up and can be found at the top of your Google Accounts Settings page. Turn it on and set it up now.
Full Disk Encryption
Set up and use full disk encryption to protect your private data, especially when travelling. Full disk encryption uses mathematical techniques to scramble data so it is unintelligible without the right key. This works independently of the policies configured in the operating system software. A different operating system or computer cannot just decide to allow access, because no computer or software can make any sense of the data without access to the right key.
Here's a useful primer on disk encryption and why it might be the most important investment you can make in your data. Windows users have access to Microsoft BitLocker while TrueCrypt provides the most cross-platform compatibility.