What can I do to understand English? English movies

If I don't live abroad and don't often deal with foreigners in my life, I think it is very difficult to have no subtitles at all. Because there are a lot of authentic spoken language and allusions, it will make people confused. Unlike media English, it's very formal, just like what you learned.

You go and see those who are recruited by the subtitle group, and basically all ask to live abroad.