English idioms and expressions are an important part of everyday

English. They come up all the time in both written and spoken English. Because idioms don't always make sense literally, you'll need to familiarize yourself with the meaning and usage of each idiom. That may seem like a lot of work, but learning idioms is fun, especially when you compare English idioms to the idioms in your own language.
Learning to use common idioms and expressions will make your English sound more native, so it's a good idea to learn some of these expressions.
You can start by learning the very common English idioms, since these are the ones you'll encounter regularly watching American movies or television shows.