Go watch this great explanation of the Languages of Love. It nicely illustrates why learning your date's languages of love is so helpful. (And it's not a show I'd usually watch, so thanks for the suggestion!)
For reference, the Languages of Love are:
As in the video, if they value gifts and quality time the most, then show them your interest (and eventually, love) that way. Gifts don't have to be expensive; they can just be a flower, or some chocolate, or even a six-pack of beer. Since they don't value touch and words less, giving them compliments or a massage won't mean a lot to them.
On the other hand, if touch and words are what they value most, then that's exactly what you should do! And gifts or watching TV with them won't mean as much.
Like everything in a relationship, it's about communication and empathy. Find out their preferred love languages, and then think:
She likes Acts of Service, so would she like it more if I got her a teddy bear or if I cooked dinner for her?
He likes Words of Affirmation, so would he like it better if I invited him to dinner with my coworkers, or if I texted him how excited I am about him?