Most Helpful Guy
Asking out: you ask to go on a specific date with her. You don't really say "hey do you wanna go out?" Well, at least, from what I've heard. You say, "hey wanna go do _____ on Saturday? Okay, it's a date". Then you go on dates until you decide to ask if she'll be your girlfriend. That's what I've heard, I've never actually done it.
Asking her straight up to be your girlfriend is kinda something that middle schoolers are known for because they don't really date beforehand.