Any help for this rookie greatly appreciated:

I'm trying to get better with the chat window in order to be more social during auto-groupings, team play, etc. I've already found some very useful threads - one of which included a very nice pdf of all the chat window commands but that list is huge.

So here is my question: what do you consider the 5 most important chat window commands that a rookie like me should practice with? Any other chat window practice advice appreciated as well.