There's one I can't quite remember about not worrying about the sky cos nobody was ever killed hitting that,
If in doubt, keep your altitude. No-one has ever collided with the sky.
For nav, With 80-90kt aircraft...
Wind at right angles to track, drift is 3/4 windspeed. Wind at 45 degrees to track, drift is half windspeed.
Wind on the nose, groundspeed equals airspeed minus total windspeed.
Wind behind you, groundspeed equals airspeed plus total windspeed.
Wind at right angles to track, groundspeed equals airspeed.
Wind at 45 degrees to track, groundspeed equals airspeed plus/minus half windspeed.
I learned this for my PPL, and I'm always amazed at how many people don't know it.