What are some fairly atomic teachable skills that most people can learn in, say, 40 hours and will significantly improve their life? The prompt for this thought process was therapeutic so Focusing and CBT were what came to mind, but other categories of answers are good too.
Driving seems like an obvious one. I think it probably takes about 20-40 hours for most people. Learning Cyrillic to fluency takes about five hours, though its utility is conditional on visiting certain places, but it's very useful even without knowing any Cyrillic languages.