The shorebased courses equipe you with a basic set of skills. These will enable you to navigate anywhere but not necessarily in the most efficient of effective manor. Where you go from here depends on the sort of sailing you do and your interest but you should never stop learning. I reckon the diference between agood sailor and a bad one is that the go one has 20 years of experience and the bad one has the same experience for 20 years. I other words experience is only useful if you learn from it.