title: How to connect from your iOS app to a backend server? how to read, modify and fetch data to backend server?
body: <p>I am new in developing iOS applications. I like to learn communication between my app and a specific back-end server(which is written in ruby). I would like to learn how to read, fetch and modify data on the back-end server? I do not have any idea where I should start? I am very welcome if you could refer me to any online resource/tutorial for this topic.</p>