When in doubt, Robert Fulghum's classic list, "All I Ever Really Needed to Know, I Learned in Kindergarten", is a pretty good rule of thumb. And I think everyone struggles with each one of those items from time to time.
There is one gem that has not made it to the list, however, and that's LISTEN. In order to get along with others, in order to create a Win Win situation in all levels of our life, we need to listen to what the other kids in the sandbox are trying to say. Only then, may we work together to build sandcastles that benefit everyone involved.