Is the bike new? Most bike shops offer tune ups after purchase, anywhere from 90 days - 1 year, so take advantage of that. They'll check everything out, adjust the cables for brakes and shifting, clean the drivetrain, etc. Other than that, just clean it regularly, including cleaning the drivetrain (chain, chainrings and cassette); buy a Park chain cleaner and you can do the chain cleaning without taking it off; I do mine 1/month. Cables are fairly easy to change, I do them 1/year (I ride about 6000 miles between 3 bikes). If there's an REI near you, look on their website for their free intro-bicycle maintenance class. Might not be any during the winter (they're in ski-season mode right now), but itw worth it to get some basics.