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
I had an issue with the 2-FA on my google account (Telecom service cut my line)
It was impossible to re-claim my google business account,
Be careful with 2-FA, if you loose your phone or something you can easily get locked out.
Yeah, always make sure to have that secret backed up.