Two-factor authentication is slowly becoming the norm on the internet. Most commonly you can find two-factor authentication or 2fa on cryptocurrency exchanges.
In fact, you would be foolish not to use 2fa on your exchange accounts, because the amount of hacking going on in this niche is insane.
Some exchanges already have 2fa as a mandatory precaution for keeping your cryptocurrency safe.
In this video, I talk about the importance of two-factor authentication and dive deep into how the Google Authenticator works.
My video is at DLive