The Importance of Biting Off More Than You Can Chew

In a nutshell means everything you want to say is small enough to fit inside a nutshell. This basically means to say lots of information in a very short sentence, very few words. So for example, maybe you've had a very busy day at work and there's so many things that you've done. It's such a short way to say what you've done, but you've summarized your whole day with productive. And the other one is to bite off more than you can chew.