Somehow, somehow people always forget to tell you the really useful stuff such as:

On career
Do what you love. Love what you do. Hence do it brilliantly. Hence get well paid.
On boys
They only talk about love to get more sex.
On girls
They only talk about sex to get more love.
On selling
It actually ain't (just) about closing; it's about great differentiator-positioning opening, too. Ask the questions which set you apart from the competition in minute 1 of meeting 1. It's nice and easy from then on.
On interviews
At the end of the day, do they like you?
On relationships
Love is a verb.
On leadership
It's a mindset. Act as a leader; don't wait for the job title, salary nor BMW. Be the person you want to become.
On work/life balance
It's the wrong question: get life balance. It's the work/life balance question which is the real problem. Did the tinker, taylor, baker or farmer have a work/life balance issue? No. Live a life where is little distinction between work and play. A foolish dream? What's wrong with one of those?
On Time Management
It can't be done. You can manage your choices, though. But then you can't blame anyone; but you are OK with that aren't you?