Kevin wants to know if the Yubikey is better than other hardware authenticators. Leo says probably not. Hardware is pretty ubiquitous now. And the mere presence of the hardware is key because it's a physical authenticator that generates a one time code that is tied to the physical key. So it's very secure. The worst is an SMS text authenticator.
Don wants to use a Yubikey to keep his computer safe online. Leo says that the Yubikey is serious two-factor authentication that enables users to generate a code to offer an extra level of security. It's a physical USB device that spits out a code with a one time password. Leo uses it for his email, Twitter, and a host of other sites online. He wishes his bank would support it. He keeps it on his keychain, using a Type C connector. But he can get a Type A adapter as well.
There's even an open source version called SOLOKEYS, which Leo says is every bit as good.
Cheryl has a Motorola Moto G6, and she wants to use a YubiKey for password security. But her phone doesn't have NFC. What can she do? Leo says that she can get a Bluetooth authenticator key like YubiKey that works with Google's Authenticator app. The Google Titan Security Key is the one to get. It's $50. There's a USB and Bluetooth key for one price. So it'll work with her laptop too.