Well,
1.) Don't post this type of stuff
2.) Don't be an idiot
3.) Don't be a jerk
4.) Don't be stupid
5.) Don't be inappropriate (though some gals may disagree with me on that point)
6.) Don't over compliment, it sounds ridiculous
7.) Don't show off
8.) Don't ask gals to do inappropriate things (it makes us want to punch y'all)
9.) Be nice
10.) Be super nice to little kids