Login using only user and password

Hi, I am developing an app and I am trying to make a login that allows acces to your account using only the user and the pasword, previoulsly created on the register, along with more data such as date of birth, country, etc. These data are stored on both a google sheet and a tinyDB.
I need my app to be able to access all the data stored an display it on a different screen, usin only the user and the pasword. How can I do that?

This sounds like you are storing personal data on individuals. How are you keeping this data secure ?

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