Classes most helpful in college for your career - which helped you the most?

What type of class did you find the most helpful in college after you got in the working world?

Back in the day, I really enjoyed my philosophy classes, over the years, I've actually found the things I learned in those to be the most helpful.

Liberal Art courses, which at first used to find useless and a waste of time, have helped me to be more confident and to improve my social skills. I guess that's it lol after 4 years in college !!!