For around 1,900 years, it was well known that if you can entertain people, feed people (farming/hunting), or protect people, that you had a job. Around the campfire years ago, the most popular person was the one who could play a musical instrument, sing, and/or tell good stories. This person might not be a hunter but nevertheless, added a lot of value from a social perspective so they were well respected.
Now things have changed, mostly because we are far removed from those core needs because a stable supply line already exists for things like food, entertainment, and military protection. There are now more jobs than ever with so many of them not even existing 50 years ago.
Becoming relevant can be more challenging in a world filled with wants because as soon as the money gets tight, the "want," market declines and jobs go away. But at the end of the day, it's the parents responsibility to help make their child relevant so he or she can prosper in the "real," world and not be a burden to others. To help identify what the market is looking for now and down the road. If I could communicate just two words to young people it would be: "Be relevant."