Is it possible to create a messenger in C#/ASP/Xamarin?

Question

Programming

At the moment I know HTML / CSS at a good level, I decided to study programming and take the creation of a messenger as the goal of studying. Please tell me if I chose a good option: C# as the main language, ASP.NET MVC for the server and Xamarin for mobile versions. Maybe I'm missing something or is there a better option?

Answer 1

Can. But one more layer is missing - the base

Answer 2

The best option is to take the creation of a useful product as the goal of the study.
The most useful product - for which you received money. Already.
Everything else - has every chance of not becoming useful.
On the topic of messengers, yes, perhaps the TCP protocol is not required, you can just use HTTP with long polling, but it's better to study native for each OS.