The landing

When the lunar module landed at 4:17 p.m EDT, only 30 seconds of fuel remained. Armstrong radios, "Houston, Tranquility Base here. The Eagle has landed." 

Armstrong later confirmed that landing was his biggest concern as there were a thousand things to worry about.

They explored the surface for two and a half hours, collecting samples and taking photographs. They left the American flag behind, a patch honouring the fallen Apollo1 crew, and a plaque on one of Eagle's legs that read, "Here men from the planet Earth first set foot upon the moon. July 1969 A.D. We came in peace for all mankind."