#1.) Don't Say You Like His Shirt . . . Tell Him He Looks Good in It. There's a slight difference, but it's an important one: If just you say it's a nice shirt, you're complimenting his fashion sense . . . which most guys don't care much about.
--But if you tell him he LOOKS GOOD in it, you're complimenting his LOOKS, not his shirt.
#2.) Compliment His Friends. First, figure out what HE likes about them. Then try to echo it. For example, if he thinks one of his friends is hilarious . . . and you do too . . . let him know.
--If he know YOU think his friends are cool, HE'LL feel cool. Just don't go overboard with it or he might get jealous.
#3.) If He's Chivalrous and Opens Doors for You, Make a Big Deal About It. Chivalry isn't engrained in men the way it used to be. And most guys have to actively THINK about doing things like opening doors and pushing in chairs.
--So if you thank him for it and mention how most guys NEVER do stuff like that, it gives him a mini ego boost.
#4.) Don't Talk About How Great His Job Is . . . Tell Him He's Really Good at It. Guys like to hear how good they are at things, especially their job . . . even if they HATE it.
--But if you just started dating and tell him his JOB is great, he'll probably assume you mean it must PAY WELL. Then he'll start wondering if you're just after his money . . . even if he doesn't make very much.