Hi, I have a news website and wanted to make an app to it. When a post publishes on website we publish it in the app. Sometimes we send notifications to our readers as well. Is it possible in this platform?!
Yes!.
Thanks! How?!
How, what?
The best way to do it would be to take a crack at it yourself (there are plenty of tutorials online) and ask the forum if you have a specific, direct question. 
Step 1: Go through Bubble Free tutorials
Step 2: Try to build some of the features you need based on what you learned in the tutorials
Step 3: When stuck on a specific feature, re-watch the free tutorials and/or search youtube for other tutorials or search the forum for past threads on the topic…if still stuck, post a question in the forum with a specific question related to the specific step in specific feature you are stuck on.
For how to build your app you will need to setup the API so that when you post on your site, the API call is ran to post into your Bubble app.