Like I said, read your help files. They explain debug versus release mode.
Let me say something else: perhaps this is a game to you, like playing Mario II, or something. If it is, have fun. In the real world it is not a game. It produces things which advance the progress of mankind. Perhaps one percent of professionals, even, get this.
This stuff is used to build intravenous infusions pumps. If you **** around, someone dies. Astronauts don't get home. Less importantly, mail doesn't get delivered. I hope you get the picture.