If English is not your first language, you may be more familiar with American-English. We have so many English resources that using this style, such as movies, songs, books, Youtube channel, etc. When you come across a resource that using British-English, you may stumble upon some words you are not familiar with. 



I want to list several words that I know of, I believe there are many that I don’t know so feel free to put more in the comment.