I totally agree with Barquito. I have seen several people come away from basic keelboat classes not really knowing how to sail.
This is through no fault of the instructors, rather there is not enough time on the water in the classes to get the "feel" of sailing. The fastest way to get the "feel" is to practice on a sailing dinghy because they are responsive even in light winds. Sail the heck out of it for a few months. Wear a lifejacket in case the boom knocks you out. Then take a basic keelboat class. The basic keelboat class will make a lot more sense after a few months sailing the dinghy.