I wouldn’t dare defile Douglas Adam’s memory by not mentioning that you should keep a towel with you at all times, but my second contender is a surprisingly short three-parter:
- never lie.
- never tell the whole truth.
- never pass up a chance to use a real bathroom.
Never take time for granted - expect you’ll have less of it than you want or need.
It can really help with getting priorities straight - whether that’s with work or with your personal life. Where is it exactly you want to spend the most valuable and limited resource you have? Your time?