How to make a custom news article database for ionic4 app

I am making an app that displays articles written by a small team. I was wondering how is it traditionally done. Where should the writers push their content, and how will the app receive/display the new content.

I looked into an API that can be used to show other news organizations, but I am looking to display my own content.

I am making the app using Ionic 4, but I would also like to eventually have a website showing the same content.

call API in your app and display news articles