good for you

This phrase is used to praise small children. It means "you did a good job".

However, when this phrase is used toward an adult, it can seem insulting. It sounds patronizing, like you are suggesting that the person you say it toward is a little kid.

"Good for you" can also seem like a rude way of saying "I don't care." For example, you might say it if someone you don't like is bragging about something:

A: I was the class president of my university.

B: Good for you.

Wow!

"Wow!" expresses excitement. You say it when someone tells you something or shows you something. You can use "wow" to express a variety of emotions about the thing you're being told or shown:

• it's interesting and exciting
• you want to encourage the person, especially a child
• you can't think of anything else to say