Coaching
Coaching is a form of development in which an experienced person, called a coach, supports a learner or client in achieving a specific personal or professional goal by providing training and guidance. The learner is sometimes called a coachee. Occasionally, coaching may mean an informal relationship between two people, of whom one has more experience and expertise than the other and offers advice and guidance as the latter learns; but coaching differs from mentoring by focusing on specific tasks or objectives, as opposed to more general goals or overall development.
Wikipedia
Coaching (noun)
The process by which someone is coached or tutored; instruction.
Mentoring (noun)
An arrangement by which one person mentors another.
Wiktionary