How to attract someone you like?

Find out what's their favorite hobby or what type of music they listen to. Once you know then you walk around them or pass by them playing their favorite song or singer this goes for the hobby too. If they love volleyball or football if you're an opposite sex go to his football games and just support him by screaming his name or team and if it's a girl do the same go to her games or walk pass her class an get a glimpse at her while she's looking.