Why is the First Vision important?

In the spring of 1820, God the Father and His Son, Jesus Christ, appeared to the Prophet Joseph Smith. This vision, which marked the beginning of the Restoration of the gospel, is the most important event since the Resurrection of Jesus Christ. Joseph Smith’s humble prayer led to the restoration of gospel truths, priesthood authority, and saving ordinances. “That one revelation answers all the [questions] regarding God and his divine personality. … His interest in humanity through authority delegated to man is apparent. The future of the work is assured. These and other glorious truths are clarified by that glorious first vision” (Teachings of Presidents of the Church: David O. McKay [2003], 93).

https://www.lds.org/youth/learn/yw/apostasy-restoration/first-vision?lang=eng

I got the following picture at https://www.lds.org/media-library/images/church-history/new-york?lang=eng&start=41&end=80&order=

Why is the First Vision important.jpg2.54 MB

why is the first vision important.jpg3.56 MB

why is the first vision important 2.jpg2.11 MB

Text for other handout from https://www.lds.org/music/library/hymns/joseph-smiths-first-prayer?lang=eng