This document discusses mentoring trainees in research, focusing on PhD/non-MD perspectives. It defines trainees as those undergoing temporary training, such as postdocs, graduate students, and undergraduate students. The role of mentors is to facilitate trainees' transition to the next stage. Mentoring involves research training, communication skills development, and career guidance. The document provides guidance on mentoring different trainee types, including focusing postdocs on independent research, giving PhD students opportunities to explore new ideas, providing well-defined projects for masters students, and exposing undergraduates to research. It also discusses generalizable skills and tools to support effective mentoring.