Life as a Ph.D. student can be fun and rewarding, but also challenging. The following articles provide some helpful tips for navigating through graduate school and preparing you to be a successful graduate student.
How to become a successful physicist
https://www.gograd.org/resources/how-to-survive-your-phd/
https://study.uq.edu.au/stories/what-makes-good-phd-student
This article by Dr. M. Dredze and H.M. Wallach offers a general guideline on “How to Be a Successful PhD Student“, although it is written for Computer Science, the general ideas apply to all disciplines including Physics.