Two-factor verification (2FA) is a security feature that protects online accounts by requiring users to provide an additional form of verification in addition to their username and password. In this tutorial, we learned how to implement 2FA in Go web applications using Twilio Verify and Gin-Gonic. We created a new Go application, registered the template directory, and defined routes for sign-in, OTP verification, and success pages. The app sends an OTP code via SMS when users log in successfully, and verifies the code using Twilio's Verify Service. With this setup, we can enhance the security of our users' accounts and improve user trust and confidence in our service.