Ask HN: What high-effort, high-reward skills have you developed in 2025?

It would be interesting to hear what current tech skills have a steep learning curve but pay off a lot afterward.

Some examples (not sure they're the best ones, but just to illustrate):

1. Vim motions

2. Rust

3. Jujutsu (as an alternative to Git)

4. Formal methods in software engineering (Alloy, TLA+)