Japanese. Learned Chinese in early twenties then started with Japanese until life happened. Picked it up again, and trying to learn it as a third language with my wife. Making progress.
Reinforcement learning, but not the deep RL stuff as much as the fundamentals and theory. Really enjoying working through https://agentmodels.org/
Rust, with a colleague, but mostly because I like my colleague.
Will soon take a class on Racket with my wife.