And because the lunar environment was alien - but comprehensibly so because of a vigorous robotic campaign leading up to Apollo - they tackled the training in many different ways. Classroom training, part-task simulators, motion simulators with artificial views, the LLRV/LLTV 1/6 G trainers, "flying" video cameras over a large-scale lunar surface, flying aircraft over land with artificially created craters arranged like the expected LZ, navigation training in planetariums (I refuse to say "planetaria"), etc., etc. As said before, intensive multimodal training for all phases of the mission.