The London Underground is a very convenient way to get around London. First, buy an Oyster Card, a reusable smart card that lets you ride at will. Maps and signs at each station will help you navigate the system. Identify your origin and destination before entering the system. There are ticket gates at all stations where you must touch your Oyster Card to gain access. Once on the train, listen for station announcements and follow the signs to transfer to other lines if necessary.