In several passages of the Christian Scriptures you will find references to Jesus learning to obey in human conditions.
Heb. 5:8 Although he was a son, he learned obedience from the things he suffered; 9 and after he had been made perfect he became responsible for everlasting salvation to all those obeying him
When Jesus lived as a spirit next to God, he had not experienced in a body of flesh the needs, obligations and limitations that humans have to live in their own flesh, so to complete his capacity as King of humans in the future he had to experience them himself.
Heb. 4:15 For we have as high priest, not one who cannot sympathize with our weaknesses, but one who has been tested in all respects like ourselves, but without sin.
Humans have mandatory limits for everything, a lower limit and an upper limit. For example: we have to eat out of necessity and if we don't eat anything we die, but if we overindulge and become gluttonous we already exceed the limit and may die also... it's like that with everything we can do with our bodies. We can compare human limitations, natural needs and obligations with a kind of slavery. Jesus became a slave in that sense.
Phil. 2:6 who, although he was existing in God’s form, did not even consider the idea of trying to be equal to God. 7 No, but he emptied himself and took a slave’s form and became human. 8 More than that, when he came as a man, he humbled himself and became obedient to the point of death, yes, death on a torture stake. 9 For this very reason, God exalted him to a superior position and kindly gave him the name that is above every other name, 10 so that in the name of Jesus every knee should bend—of those in heaven and those on earth and those under the ground— 11 and every tongue should openly acknowledge that Jesus Christ is Lord to the glory of God the Father.
Jesus' complete obedience contributed positively to human hope under his deserved reign. He became ready to assume the future Kingdom over mankind. All that benefits us in the sense that he knows what is experienced in the flesh.
Heb. 2:16 For it is not really angels he is assisting, but he is assisting Abraham’s offspring. 17 Consequently, he had to become like his “brothers” in all respects, so that he could become a merciful and faithful high priest in things relating to God, in order to offer a propitiatory sacrifice for the sins of the people. 18 Since he himself has suffered when being put to the test, he is able to come to the aid of those who are being put to the test.
PS: Jesus' brothers (144,000) have to be faithful like him, and learn from suffering to be able to reign with him.