I am going camping on top of a tall ass mountain in the middle of nowhere and I will have my camera equipment with me. What are some basic/beginner tips/advice for astro photography? I have a whole book on it that I am bringing with me but I'd like to hear from you guys as well.

I am looking for tips along the lines of
>dont do exposures longer than 30s because shit moves
>set aperture as wide as possible
>how to set focus