You will learn:

Chew the fat: have a casual conversation. 

Ex: After the meeting, Tom and Susan stayed a few minutes to chew the fat.

In a nutshell: a summary.

Ex: The park ranger gave a  very long report about the dangers of forest fires. In a nutshell: Be careful with your campfires!

A piece of cake: easy!

Ex: Shela was happy about her driving est. She expected it to be tricky, but it was a piece of cake.

take it with a grain of salt: don't believe it completely.

Ex: Because the study was done by a company that wants to sell the product, people should take the results with a  grain of salt.

Butter someone up: say nice things to someone to win his or her favor.