A couple of my favorites are: "Cool your jets," which is another way of telling someone to calm down, or "it is what it is," which means exactly that - it's out of your control and there's nothing you can do to change it.

I believe you should learn idioms because they are interesting, fun to know, and because you will hear them and need to understand them. I do NOT think you should deliberately try to "add them to your repertoire."

Inna 0 seconds ago There are books of idioms but the most valuable to me are the idioms that I've heard from real people in the US. Here are a few that I have written down: Take a chill pill = calm down; It cost me an arm and a leg = it was very expensive; to be brain dead = to be very tired, unable to think; Nothing to write mama about = not interesting; Hold your horses = calm down, don't hurry; Whatever floats your boat = whatever makes you happy; Hold your horses = calm down, don't hurry; to break the camel's back = to be the last drop; To beat things to death = to be a perfectionist

There are books of idioms but the most valuable to me are the idioms that I've heard from real people in the US. Here are a few that I have written down: Take a chill pill = calm down It cost me an arm and a leg = it was very expensive to be brain dead = to be very tired, unable to think Nothing to write mama about Hold your horses = calm down, don't hurry= not interesting Whatever floats your boat = whatever makes you happy Hold your horses = calm down, don't hurry to break the camel's back = to be the last drop To beat things to death = to be a perfectionist

There are hundreds. It's best to search online, where you find lists, or to get a book devoted to idioms.