Best CS:GO Tip?

Although others may suggest much more professional tips, I have a few that are obvious.

1. Don't act like a pro or as if it was natural, it makes you look gay. (when you get a l33t kill)
2. If you're a Terrorist, Rush B.
3. Don't brag about top fragging, nor insult others that are doing worse than you. Usually being nice can earn you commends or even a friend to play with.