Most clubs teach sequentially. This means that the moves you learn this week, are reviewed next week and then danced regularly on subsequent weeks. This also means that it's easiest if you join a club at the begining when it is starting to teach new dancers. Usually this is in September (or perhaps January if a club schedule permits). New moves are taught weekly, slowly building up your growing repetoire of moves. When possible, clubs and leaders usually try to make arrangements for missed classes or for people starting later.