I'd like to learn how to develop notifications for an Android app, so they can be updated online. That is, every time there is a app update, I would like a notification similar to that of the image to appear.
Nothing better than Google's own documentation.
You can do from notifications with the standard layout (remembering that the default layout changes from version to version of Android, ie, that layout of this image will not be the same for version 6.0, for example) until notifications with custom layout.
While the action that will trigger the notification, this is already the logic of your app.