I think a simple rule of business is, if you do the things that are easier first, then you can actually make a lot of progress.
So given a Time Turner, I would tell my 21-year-old self that personal happiness lies in knowing that life is not a check-list of acquisition or achievement. Your qualifications, your CV, are not your life, though you will meet many people of my age and older who confuse the two. Life is difficult, and complicated, and beyond anyone’s total control, and the humility to know that will enable you to survive its vicissitudes.
I'm not a woman, I'm not a man, I'm something that you'll never understand.
If you are brave to say 'good bye', life will reward you with a new 'hello'.
In looking for someone to hire, you look for three qualities: integrity, intelligence, and energy. But the most important is integrity because if they don't have that, the other two qualities, intelligence and energy, are going to kill you.