What projects are worth doing in C for a beginner?

Question

C++ / C#

I have two years of experience as a web developer (php, js, ts, bash)

I study C just for fun.
I would like to know the opinion of programmers who work in the C language, what projects can be done for a beginner in C to improve their understanding and work of the language and at the same time face multiple problems when developing in C?

And at the same time, so that it would not be shameful to spread it on github and show it to employers.

I ask you to give practical advice, and not stupid ones such as: you are a web programmer, you are studying che, start growing, si is dying, and so on.

Answer 1

Asynchronous network services.

Answer 2

If it's just for fun - a client-server text game with a multi-threaded server. There used to be such MUD - Multi-Users Dimensions.