2002 Audi A6 - Won't roll

why is my 2003 audi a6 not rolling over when i try to start it but when i brought it up to ol’rileys they said the spark plug, battery, and alternator were all good. I don’t know much about it other than that.

By not rolling over does that mean nothing happens when you try to start it or the engine is being turned by the starter but does not start and idle on its own ? How did you get it to O’riellys ?