Where to throw servers in client-server applications?

Question

MySQL

It is necessary to make a client-server application. The server is required to 1) listen to data coming from clients (android application) and write it to the database, 2) display something at the request of clients. Question: how to make such a server?
I don’t understand anything in this topic, so I ask you to at least indicate the direction where you need to dig

Answer 1

https://firebase.google.com/