how to fetch data from app to shopify website using php
I am starting to create my first app.
I have created partner account and created app as well. I have integrated the library also. Done with app installation and authorization.
Now I am stuck for the next step. I don't understand how can I linked my code and settings implemented on my app to shopify frontend. How can I link the app database to shopify website?
I save all the customized data in the app and how can I link that data with shopify website.
I am able to make standalone app with php but don't understand how it's data can be linked to shopify website. How my app database can be used in shopify website.
I am new here. Any help is very much appreciated.