Here's a real quickie because I'm insanely busy at work, what with all these holidays and such. Everyone, and I mean EVERYONE must follow this rule, especially this time of year, and I'm going to put it in bold to indicate how strongly I feel about this:
IF YOU DON'T KNOW ANYTHING ABOUT SPORTS THEN YOU CAN'T COMMENT ABOUT SPORTS.
There are a few exceptions to this rule. If you don't know anything about sports you're allowed to make blatantly obvious statements, such as:
"Man, the Yankees are playing well right now."
"I heard about that James Thome hitting his 500th home run."
"The playoffs are starting soon."
"The Mets pitching has been pretty awful recently."
Sample statements that would not be allowed:
"The Yankees are the best team in baseball."
"Derek Jeter is a good shortstop."
"Willie Randolph should be fired."
I'm not saying that any of the above statements are false (Only 1 of them is probably true); I'm saying that unless you have an armory full of ammunition to support a claim like any of those, don't say it, because I will attack you with stats until your brain explodes.