Everyone knows that you should use long passwords that are difficult to guess, and never reuse passwords. The best way to actually accomplish this is by using password management software like LastPass. When you set up lastpass, be sure to use a long passphrase and set up two-factor authentication for your lastpass account. Then install the plugin on every web browser you use. Now allow lastpass to save all of your passwords, and generate really long random strings as passwords when you create new ones.One final step is to go back and change your old passwords that are bad or reused. That way, when there is a breach like the one suffered by LinkedIn recently and one of your email/password combinations is exposed to the world, the damage is limited to that one passwords and website.