I have come across a number of fantastic resources for helping students navigate graduate school, academia, research, and career planning. These are especially helpful for students looking to understand typically unwritten customs and procedures. This page is by no means comprehensive and I will add more as I come across new resources and finish writing guides of my own.
(Caveat: these resources resonate with my own experiences in USA and Canada, but may not generalize to experiences in other countries.)
On interacting with faculty:
On graduate school and academic research:
On the academic job market: