The best monologue is the one that is the closest to your personality, so choose wisely.
Monologues are a staple of every new actors tool kit. The best way to nail that audition is to get it as close to who you are as possible when you are just beginning your career. I go over why this is the best tactic to use when starting out, but that's not the only thing you need to know. Looking behind the curtain and realizing that there are other things going on than just you reading the sides and how those are just as important to winning that role as are your acting chops.