The onus of action is upon the student, if they require assistance or have questions they should get in contact with the principle investigator (PI). You must be a self-starter.
The PI's duty is to provide mentoring and education in basic and clinical research. As such it is the PI's responsibility to direct projects, review publications, and secure funding.
The student's duty is to educate themselves through class work, research, and self-study. As such it is the student's responsibility to perform the research, prepare publications, obtain fellowships and assistantships, and complete thesis work.
Lab notebooks must be brought to each meeting and must be neat, organized and up to date. Record references. Write down questions and answer them. Imagine if you vanished what someone would need to do to pick up your project with only your lab notebook handy. Remember two important things: (1) nothing loose (except code, see below), only if it is physically attached to the notebook is it part of the notebook and (2) date and time everything. Critical components of the notebook, note that this is based on procedural/imaging framework and that not all these may be appropriate for all projects: