A day of shooting can be very tiring because there will be a lot of downtime. Modifying the set, changing characters and extras or bringing in props can mean you’ll be waiting around quite a lot. But try not to be too antisocial or glued to your phone; talk (and especially listen) quietly to other people on set. Show your engagement, your motivation, your eagerness to learn. During shooting, listen to the directions of the director or photographer. Greet everyone at arrival and when you leave.