English idioms are the often silly phrases that all English native speakers use - that frequently have no meaning at all to non-native listeners. But, idioms tend to be interesting, so many students of English enjoy studying them and they WILL help students understand what is being said.
This is a great and awesome video to learnt about IDIOMS:
http://www.englishvideolesson.com/3363-everyday-english-idioms.html
