These course will teach you to sail, yes very good stuff, highly recommended. BUT, Blah Blah Blah. Want counts is time on the water as skipper. Period. There is no such thing as a bareboat "certification." Your experience in your logbook will either let you rent a boat or not. The charter company wants to see how much time you have as skipper. There is a great amount of lying and resume inflation on the charter company qualification forms; no time as skipper? then you're going to have to hire one.