From the Encyclopedia of Mormonism:
“No official Church teaching attempts to specify all the ways in which God progresses in his exalted spheres; “there is no end to [His] works, neither to [His] words” (Moses 1:38). God’s glory and power are enhanced as his children progress in glory and power (see Moses 1:39; Young, JD 10:5). Ideas have been advanced to explain how God might progress in knowledge and still be perfect and know all things (see Foreknowledge of God; Omnipotent God; Omnipresence of God; Omniscience of God).”
eom.byu.edu/index.php/Eternal_Progression
“Gods and humans represent a single divine lineage, the same species of being, although they and he are at different stages of progress.”
"Thus, the Father became the Father at some time before “the beginning” as humans know it, by experiencing a mortality similar to that experienced on earth. There has been speculation among some Latter-day Saints on the implications of this doctrine, but nothing has been revealed to the Church about conditions before the “beginning” as mortals know it. The important points of the doctrine for Latter-day Saints are that Gods and humans are the same species of being, but at different stages of development in a divine continuum, and that the heavenly Father and Mother are the heavenly pattern, model, and example of what mortals can become through obedience to the gospel (see Mother in Heaven). "
eom.byu.edu/index.php/God_the_Father