Question

How many times humans landed on the moon?

Answer 1

Manned landings, six times (Apollo 11, 12, 14, 15, 16, and 17). Apollo 13 experienced a system failure that prevented a landing, so it flew around the moon and came back. Apollo 8 also did an orbit and return, and Apollo 10's Lunar Module descended partway to the surface and then came back; they were just testing the systems before the landing of Apollo 11. Apollo 9 did not leave Earth orbit; it was a test of the Lunar Module docking system. 

Of unmanned robotic missions there have been several dozen. These include flybys, deliberate crashes, orbiters, landers, and landers capable of taking off again and returning samples to Earth.