Don't do backward spirals on crowded practice ice.
If a coach tells you to do something-- your coach or another coach-- for pity's sake just do it. Don't stand there arguing. You can get into it later, when you're not interfering with the session. And if a coach who is not your own tells you to do something, you can be pretty sure that you are engaged in a huge error, because interfering with someone else's student is the biggest no-no in coaching and it's not going to happen for frivolous reasons.
Yield to inexperienced skaters whether they have the right of way or not. Would you rather be right or upright?
Don't play chicken. (I might also phrase that don't be an idiot, but that would be rude.)
Don't talk back to coaches, even adult skaters. Again, take it up later. No attitude on practice ice please, no one has time.
And, finally: Don't. Stand. In. The. Lutz. Corner.