I know C++ which I have learnt from competitive programming, and we also use it at school. I also know python, which was actually my first language, but now I mainly use it for personal projects. I have learnt HTML and CSS for websites like this, but I'm not fully confident in them.
I am quite familiar with the linux terminal, since I have a raspberry pi which I've been using for homelabbing(NAS, Pi hole, Minecraft server, etc.). I am also quite familiar with both the godot-, and unity game engine.