The Center maintains a free archive of bridge lessons and hand analyses you can study between games and classes.
Roger Lord’s lesson series covers Competing Against the Opponents, the Advancer’s Turn, Stayman, Jacoby Transfers, the Strong Artificial 2-Club Opening, and Strong Balanced Opening Bids.
The archive also includes Roger Lord’s mini-lessons and hand analyses and Bruce Greenspan’s “Sweeping Out the Corners of the Bridge Mind.”