The fun one to me is realizing how much higher Polaris is in the sky the further north you go. I saw the Big Dipper which guided me to it. Which is actually one of those skills. There are a few constellations that can be used as guides to find other objects along with using your hand to measure angles/distance so you can navigate pretty efficiently.

https://www.timeanddate.com/astronomy/measuring-the-sky-by-h...

Measuring the angle of the north star in the sky was a fun trig refresher