Graduate school can be very difficult, but it can also be an extremely rewarding period of your life. 
On this page, I've assembled some thoughts and links that I think might be useful advice for those considering, or already in, graduate school. Click on any image to read more! 

Gu and Bourne's 10 simple rules for graduate students.
Provides great advice on how to get the most of your time.

Stearns and Huey's classic exchange about what to expect from graduate school.

Kearns and Gardiner on the care and maintenance of your advisor.

John Thompson writes about being a successful graduate student in the sciences.

"Some Advice for early career scientists", by John P. Smol

This is some advice written by Brian McGill, on how to get through your qualifying PhD exams and have a positive experience. 

Photo: “I’m stumped” by Martyn Wright

Stephan Heard talks about how: Every qualifying-exam candidate should say “I don’t know”

There are also some other great webpages that compile advice for grad students and scientists. 
These are a few that I particularly like:

Spencer Hall's grad resources page is filled with links to great advice on topics such as writing, being a graduate student, getting a job, and much more.

Emily Bernhardt's Lab site @ Duke has great advice.