If you want to invest in art, the best place to start is at a museum or gallery. Talk with people who work there as art advisors, and see if you can see any upcoming exhibitions that might interest you; this way, you're also likely to learn a lot about the artists. The other good place to start is joining discussion forums or groups where people like art congregate (i.e., online communities). There are many such communities on the web, and you're likely to learn a lot by participating. If you want to learn more about paintings, you could also sign up for  Masterworks and read their curated newsletters regarding pricing, famous artists, and historical price trends.