This is probably something I should have either known about (or already asked someone about) after having played this many seasons of HD, but I was curious if someone could tell me the actual impacts of defensive positioning. If I play to take away the perimeter, does that do anything besides stop 3's? If I play way inside, am I letting them chuck up a lot of 3's but defending against every other type of shot? Do mid-range shots factor in at all? And I've heard something about inside positioning having an effect on fouls... is this true?

Thanks in advance for answering a real n00b question... I usually adjust positioning but it would probably be more useful if I had a true understanding of what it did.