Baseball's code

I really wish that I better understood baseball's unwritten code. Like whether or not it is acceptable to try to steal signs, when it becomes unacceptable to try to steal bases, and when a beaning is not only acceptable, but the beaned batter does not get mad at the pitcher for the beaning, but his own teammate for provoking it. Heck, our manager said that "[t]hey did the right thing” by intentionally hitting one of our players with a baseball at 90 mph.