“Jesus died for humanity’s sins, offering himself as a sacrifice to save the world”
Jesus, being sinless, willingly gave his life on the cross to atone for the sins of all people, acting as a perfect sacrifice to reconcile humanity with God and provided a path to salvation from the consequences of sin, essentially “saving the world” by offering forgiveness and redemption to those who believe in him, this is the ultimate act of love and grace.
In John 14:2 Jesus is telling his disciples that by dying and rising again he’ll go and prepare a place for them and for us. Once we choose Christ eternal gift and atonement for our sins has been made the way is opened and there’ll be lots of rooms in the Father’s house.
God has given us our free will to choose eternal life with him, or we are rejecting God and will not be part of his eternal family.