I fogot to mention that I already worked with multiple programming languages, C, C#, javascript, GDScript and python but I'm more used to python to be honest.
And this project can showcase that, it's an app with a C backend, python API and for the frontend two GUI C# winforms and a javascript page hosted with the API here is the link https://github.com/Jujulien45/Fitness-traking.
I made it for school so a good part of the C# GUI is made by IA as my teacher pushes us to use IA and the deadline was tight. But everything else is handwritten.
Also this projet is about where my current skill level is I made it about 4 months ago.