Compliments don't have any worth other than what we give them — they're not things to be exchanged for favors, used to flatter people we need to like us, or given out for no reason. Compliments are only meaningful when the person giving the compliment truly believes in them. Giving a fake compliment is a white lie at best and, at worst, can be seriously harmful, so don't do it.  For example, let's say that a guy friend has just gotten off stage after bombing at the talent show. If might at first seem like a good idea to lift his spirits with a fake compliment like, "Wow! That was amazing! Great job!" However, since he probably knows that he didn't do well, this may make him feel even worse. In this case, it's probably best to go with a sincere option like "Hey, don't worry. You'll nail it next time." Study of the brain shows that we use the patterns and stresses of speech to distinguish white lies from truth more so than non-spoken cues. If you're not being sincere, the guy will hear it in your voice. Most of the time, gracious compliments will be greatly appreciated. However, it's not always appropriate to give compliments — doing so at inopportune times can be slightly embarrassing at best (and a major faux pas at worst). Below are just a few examples of times when you won't want to give a guy a compliment, or at least will want to keep your compliment short and polite:  At solemn occasions (funerals, memorials, etc.) After he's just been embarrassed When his jealous significant other is around When he's concentrating on something difficult It's worth being aware that some guys can get embarrassed if they receive a compliment (especially a romantic one) when they're in front of their friends. In this case, since the guy is worried about saving face in front of his buddies, your compliment may have the opposite effect as you intended. at him. Nothing spells sincerity like a smile! For some guys (especially those who are attracted to you), the simple pleasure of seeing your smile can be a compliment in...

TL;DR in Indonesian:
Sampaikan dengan tulus. Pilih waktu yang tepat. Tersenyumlah Sampaikan pujian secara ringkas dan padat. Perlakukan dia seperti Anda memperlakukan orang lain.