TL;DR: A wide range of online courses from Harvard University are available for free on edX. edX is a popular platform that hosts a large bank of free online courses from some of the top ...

Quelch, John A., Carin-Isabel Knoop, and Amy Gallo. "What to Do for a Struggling Colleague?" Harvard Business Review 94, no. 5 (May 2016): 109–111.

Free, one-hour guided tours – led by Harvard students – are available at various times of the day and year, depending on the university's schedule. Visit the school's website for more information.