He saw God and Jesus Christ 1820 in a forest, after he put the question in prayer, which church he should join. The answer he got, surprised him, cause he was said not to join any of the existing churches in 1820.

Later, he translated the golden plates, that the angel Moroni showed him where to find. Later Joseph Smith got the Doctrine & Covenants and The pearl of great price by revelation also.

On the 6th of April 1830, he got the comandment from Jesus Christ, to restore his church on earth an to give it his name:

Church Of Jesus Christ Of Latter Day Saints (D&C 20).

Every man and every woman, who really wants to get assurance that these events took place and are true, can know through study of the Book of Mormon and through prayer to God that it´s true and from God (Moroni 10:3-5).