Whatever language fits the problem. Mostly Python, TypeScript, Java, and C++ lately.
PythonTypeScriptJavaScriptJavaC++Rust
I've been writing code for a long time, picking up languages as projects called for them. Python for ML and quick scripts, TypeScript for the web side of everything (this site, Story Galaxy, Angulus), Java for FTC, and C++ for competitive programming.
I like coding most when it's the means to something else: a tool that didn't exist before, a thing to play with, or a robot that suddenly works.