Why 2-Step?
2-Step verification provides an added layer of security to your account.
How do I 2-Step?
Use your phone to send a code by text, voice call, or mobile app.
Where can I 2-Step?
If you use VPN, you're already 2-stepping with DUO, but GMail will let you 2-step, as well: https://support.google.com/accounts/answer/185839