Remember where you came from.

Watch the growth of middle level management. Don't automatically fill vacant jobs. Leave some positions unfilled for 6-8 months to see what happens. You will find you won't need to fill some of them.

Have a deputy and develop a successor. Don't be consumed by the job or you'll risk losing your balance. Keep your mooring lines to the outside world - family, friends, neighbors, people out of government, and people who may not agree with you.

You can have a broad popular democracy movement and have it end being taken over by the most vicious people and the result is you don't end up with free political systems or free economic systems, you end up with a handful of radicals controlling the country.

Control your time. If you're working off your in-box, you're working off the priorities of others. Be sure the staff is working on what you move to them from the President, or the President will be reacting, not leading.

I'm glad you asked. It has nothing to do with oil, literally nothing to do with oil.

If I know the answer I'll tell you the answer, and if I don't I'll just respond cleverly.