That is a great post! The most important thing players should have is patience with others and with themselves!
Normally, insensitive people always blame healers for some of them not damaging the boss.
In my experience, it's valid that healers should learn how to attack while the others aren't in danger, but on the other side, almost nobody explains this to them.
Your guide is great! Also, people should be more polite about everything in WOW, LFR is a good example where people blame the others playing the raid for the first time.
If you player can, teach the mechanics and see if everybody understood it.