Going to the Moon was a lot of work.  Saturn V rocket (left) was as tall as 36-story building, weighed about 3,000 tons.  A man was drawn in the drawing to show how big it was. 

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Coming back from the Moon did not require hardware of that magnitude.  Lunar Module (right) orbited the Moon, landed the Moon, and took off again to return to the space.

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Lifting stuff off the Moon is not very hard.  There is no atmosphere, so there is no drag or aero-heating.  Also, velocity required to get off the Moon is 2.4 km/sec, compared to 11.2 km/sec to get off the Earth.  Even without consideration to the atmospheric effect, it requires only about 1/20th of energy to launch spacecraft from the Moon, compared to launching from the Earth.

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