If you play jazz, then you play with your fingers. If you're playing rock, you use a pick. There's really no rhyme or reason to that other than that's just the way it has been.
Immigrants provide skills that we simply cannot afford to do without. They have contributed hugely to Britain's success.
You have to examine a scene on the page first. Then you get into the basics of acting: Who are you? Who are you talking to? How do you feel about that person?