power bi service

I am new to power bi. I have power bi account there I created some dashboards with some reports, now I want to consume those dashboard and report using power bi rest API (https://docs.microsoft.com/en-us/rest/api/power-bi/)in our own application. Our application we used the .net core for back-end and angular 6 for the front end. We need to call power bi API from the .net core. If I change report in power it should also reflect in our application. I am new so I am not understanding from where to start?