I started to read the Bible from cover to cover

[Angry Dragon]

In doing this I have run across some things that do not make sense to be
One of them being Exodus 4:21-27 this quote below is from NIV and I am reading the KJV


21 The Lord said to Moses, “When you return to Egypt, see that you perform before Pharaoh all the wonders I have given you the power to do. But I will harden his heart so that he will not let the people go. 22 Then say to Pharaoh, ‘This is what the Lord says: Israel is my firstborn son, 23 and I told you, “Let my son go, so he may worship me.” But you refused to let him go; so I will kill your firstborn son.’”

24 At a lodging place on the way, the Lord met Moses[a] and was about to kill him. 25 But Zipporah took a flint knife, cut off her son’s foreskin and touched Moses’ feet with it. “Surely you are a bridegroom of blood to me,” she said. 26 So the Lord let him alone. (At that time she said “bridegroom of blood,” referring to circumcision.)

27 The Lord said to Aaron, “Go into the wilderness to meet Moses.” So he met Moses at the mountain of God and kissed him. 28 Then Moses told Aaron everything the Lord had sent him to say, and also about all the signs he had commanded him to perform.

I am lost in these words, makes no sense to me. Anyone out there that can tell me what I am missing??