Excellent question. Me as father of two young teens (and working in IT and ML and sitting in EU) is thinking a lot about this. My conclusions are:

• learn English (and may be Spanish). OK, we have all of this AI translation now, but you should be able to communicate around the world.
• learn skills (job) you can use world wide. IT is among the best, can be done remotely but yes, there is high competition (double edge sword). Please not select some really local job (as weird mother tongue language dialect linguists).
• be the best in your skills, which implies to learn new things all the time (to be on the edge).
• it is good to combine 2 areas .. this makes you quite unique.
• critical thinking, reasoning = math, logic. on the other hand some creativity is also needed.
• physical job is very OK. (if the above is met)
• understand health and money (keep you healthy and "rich"), do not let others and state to screw your life.

Why? Because the world is changing faster and faster. The time where you was OK with stuff from you school (even university) for your entire life is history. If you want to be competitive, you need to learn. I see it on myself in IT. I'm doomed by youngsters.
Why? Because I do not think EU will be good and safe place for their entire life. These times passed. So they should be ready to relocate = have compatible skills.

Now the most difficult part is how to implement this. But I cannot force them, so I'm explaining it and reasoning and doing gradually smaller and smaller decisions in their life. I'm trying to identify their strong abilities and emphasize them. Also randomly challenge them with new things so they can explore some new skills they like.

Am I doing it right? No. :) I just hope they will not screw their life by a single very bad decision totally :).