Who is the first person visited the moon ?
Can any person again visit the moon ?

See the following links to answer your questions:

Moon landing - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Moon_Landing)
Vision for Space Exploration - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Vision_for_Space_Exploration)

Good answer and links above.

American astronaut, Neil Armstrong was the first man to set foot on the moon. He commanded the mission and was accompanied by Americans Michael Collins and Buzz Aldrin. That was on July 20th of 1969.

I remember that first manned landing in 1969 on the moon and that first step by a man on the moon. As a family, we were all in our parent's bedroom watching it "live" on t.v. I will never forget the experience of seeing it.

In answer to the second part of your question, yes, people can visit the moon again.