Which method / language to choose for the "personal account" system?

Question

MySQL

Hello everyone, I decided to make one service, which will be a server part and a client under Windows in C#.
In the client, the user needs to log in or register. The server must authorize/register the user.
Next, each user has "properties". For example: grades received, number of assignments completed, etc. Also, the server must have materials (one user can send to another) that contain text and pictures.
Question: on what to write the server part? My first thought was MySQL, but since Since I have never worked with databases and in general with the server part, then, in fact, this question arises.

Answer 1

You have a mess in your head if you are going to store any information without databases. And by the way, almost no one writes the server part on the database, as a rule, there are programming languages ​​for this. In your case with # as I understand it.

Answer 2

Write the client part in C#
and the server part:
choose a scripting language: asp, php, python (one of your choice)
choose databases: Postgree, MySQL, etc. (one of your choice)

Answer 3

First, formalize the TOR - one item - one sentence. what you need, clearly and to the point.
further you will be easier, but now it really looks more like porridge