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.
Evaluate how much something matters based on 1 day, 1 month, 1 year.
I.E. How upset should you be over [Thing]? Will it matter in one day? One month? One year? That helps perspective a bunch. You can use any variation of time really, the point is perspective
Came here to say this. Always a good piece of solid advice IMO