This is a three step approach: 1: The better you know a language, the easier it becomes to discern between different dialects 2: Listening to music or radio in that dialect, maybe with a local channel in the area where that dialect is spoken 3: Speaking the dialect. Go to a place where native speakers of the dialect gather, i.e. a gym, library, book club etc.

Easily? Probably impossible. Pick the accent or accents you're most interested in and find ways to listen to it (movies, series, etc.).

First of all, don’t be afraid to ask someone to repeat what they have said if they are speaking with a strong accent. Most native English speakers can struggle to understand someone who is speaking with a strong accent. 👍🏻👍🏻 As practice I always recommend watching movies or tv series which are set in different English speaking countries or that are set in different cities around the UK or USA so you can listen to many different accents. While you’re watching, make sure you use English subtitles and pause it whenever you read a phrase that you don’t understand so that you can add it to your vocabulary book.

有很多英语口音，但大多数都非常相似，不会成为问题。 虽然，我是母语人士，有一些口音我听不懂。 （例如：路易斯安那州和苏格兰） 我认为最好是先熟练掌握一种口音，然后再调整耳朵适应其他口音。 There are many English accents, but most of them are similar enough to not be a problem. Although, I am a native speaker and there are a few accents that I have trouble understanding. (For example: Louisiana and Scotland) I think it is best to become fluent in one accent, and then adjust your ears to other accents. Good luck!