Re: How to foul less?
Keep your arms straight (know when to block but otherwise try to obstruct their view) and make sure you do warmups before a game to keep your feet quick. Not much else to it IMO.
Stay in front of your man and adjust fast, gotta know where your man's feet are and where yours are. Don't focus so much on blocking, a lot of days it can be a waste of time because you'll be grazing their arm just enough. Only block when you 'feel' it.
Hope this makes sense.