1. go for it

Today we are going to learn “go for it”. It means trying hard to achieve a certain goal.
A: Do you think I can be a movie star?
B: Sure, go for it!

2. magic word

Another phrase is “magic word”. It means some essential words, especially when you want to emphasize something.
A: Give me that!
B: You didn’t say the magic word. It’s “please,” remember?