You should read things that interest you. Comic books will have a lot of non-standard dialogue. If you choose to read them, please don't post 50 questions asking why people said something that doesn't seem correct; it's probably not correct.
If you like sports, read the sports section of an English-language newspaper.
If you like movies, read movie reviews.
If you like music, find biographies about your favorite musician. (Don't use song lyrics - please!)
Student or Learner