nostr:npub1gfdrrw9629qxwvwaa3vwnvzhtaqu2c5m9wf6vcwjnmdnhs7hl4jsux7gg6 depending on what they want to do.
If they want to program micro-controllers Python or JS won't be my first choice.
If they just want to learn to code for fun or don't have a concrete idea, always 3, Python.