http://www.cs.jhu.edu/~mdredze/publications/HowtoBeaSuccessfulPhDStudent.1_1.pdf
https://www.ams.org/notices/199701/comm-rota.pdf
https://arxiv.org/pdf/gr-qc/9703019.pdf
http://joschu.net/blog/opinionated-guide-ml-research.html
Keep reading
Schedule life, research, sleep, exercise, social activity, entertainment properly.
Pay attention to the motivation of the work