Popsugar Living Advice People Share the Things They Wish They'd Known at 21 People Share What They Wish They'd Known When They Were 21, and It's Such Good Advice January 23, 2020 by Erin Cullum View On One Page Photo 9 of 21 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 9 Communicate With Your Roommates Leaving passive-aggressive Post-it notes for roommates about cleaning up their mess isn't the best form of communication. Previous Next Start Slideshow AdviceCollegeWellnessSelf Improvement