Wireless data transmission receiving and sending

Hi all,
This is my first question on this forum.

I am making a project in which I will receive data from one mobile app and then this data has to be displayed on a large screen.

Please tell me the procedure and methods which I need to know to make this project.

thank you in advance.

Use Chromecast?

I am making a project in which I will receive data from one mobile app and then this data has to be displayed on a large screen.

What function is the arduino to play in this? I suggest the mobile device have a web server and the display be a web page of some sort supplied to a web browser.