How to write a server side under unity?

Question

Unity

Tell me articles on how to make a server part under unity, in PHP (although it’s well known), as I understand it, it’s not an option, unless of course the game is not step-by-step, I tried step-by-step, it turns out, but it won’t work with dynamics ...
I think C # (a little familiar), although many on the forums write that the best option is node.js + socket.io ... (not yet familiar)
Of course, I would like to read full examples from the beginning to the test, how to where, etc.
Interested in any useful articles and examples on my question...

I studied Photon a little, but I don’t like, firstly, that I don’t see what is happening on the server, and secondly, I need to save data on the server about what is happening on the stage now, I don’t want to use photon and send it separately to the server with PHP data that is written to the database, plus online restrictions (when developing, then nothing and then) ...

In general, I came to the conclusion that it is better to write your own server part and use your own server, of course it will take longer, but no restrictions and everything is your own .. .