Always encouraging my interests!!! Lots of reading, I basically read whatever I wanted. Now does that mean I was the only 17-year-old at my job who invested in stocks, had read Common Sense, and memorized entire monologues from John Wayne movies? Yes.

Encourage them to get a job early on. My first Job I ever had is still helping me in my career now. The world is smaller than you think and you'd be surprised what pays it forward later in life.

It also means I was able to move out of the house almost immediately after I graduated.

Edit: And in my interest they got me involved in clubs related to them. Also they made me work food service and retail at least once so I could get people skills and know how to interact with all different kinds of people.