Leave QDT a little smarter than when you arrived. Browse our collection of downloadable guides and other goodies to help you do things better. We offer PDFs you can download and carry with you when you’re in a knowledge pinch.

We surveyed editors and editorial assistants at Macmillan Publishers to learn about the most common mistakes they see.

We've come a long way since the days of eating fiber for "roughage." Fiber is a dietary wonder that can help with a number of health concerns! Match your concern to the best fiber type with this helpful infographic.

A quick and dirty guide to navigating life post-graduation, written by experts in every aspect of life. 

You don't have to completely give up on sweeteners, but you should get the scoop on how to use them in moderation and what your alternatives are. 

Do you know the difference between 'who' and 'whom'? Time to show off your skills in this Grammar Girl original quiz.

Do you know the difference between 'lay' and 'lie'? It's easy to get them mixed up, but you won't forget anymore after taking this quiz.