Integrate users and login with existing system

Hi there. I am new to Auth0. I want to use Auth0 login because I want to implement 2 Factor Authentication. I have an existing application with it’s own authentication system. I want to develop a React SPA using Auth0 login and using my existing application API.
My Question is how can I integrate Auth0 authentication with my existing application? How to integrate users between them? can I call my system’s API duing Auth0 login?
Please direct me to which document I should read for this, thanks!

Hey there @online.eric!

Glad to have you in our community. I guess you should start with this one:

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