Are there any quick wins that 30 ~ 60 minutes of intense concentration can generate?

For example an average person, if focused, can learn to read (but not understand) Korean decently in under an hour.

A person can also learn a few guitar chords and possibly play a carefully-chosen song in that time.

But those aren't valuable skills in themselves.

Do you know of any simple + valuable wins in your area of interest?

("valuable" intentionally left vague)