What are the obvious features of pronunciation, vocabulary and grammar in dialect areas?
In English, there are no obvious features, mainly because some dialects have some words that are not commonly used in the mainstream language, and there are some special collocations for people who use these words in a certain area, but most of the words and languages of this language are still in line with the mainstream language. Generally speaking, if you study English, this point can be ignored in the early stage, because there is no learning environment and no use environment, even if you study for a while and use it, you will forget it.