If you're at all serious about online security, you're sure to have at least a passing familiarity with two-factor authentication, or 2FA. Single-use codes sent in text messages or emails are probably the most common type of 2FA, but there are more secure methods. The YubiKey 5C NFC facilitates several of those methods in a small, affordable package: at 55 bucks, it's a pretty fantastic little gadget. Honestly, everybody should have one of these things.