Who killed Goliath??? If you read the ESV you get it half right as well as all wrong...

If you prefer to read from the perverted ESV you will see that Goliath was killed twice. Poor guy. The ESV has David first killing him and then Elhanan. What???

Why would you trust a version translated out of the perverted stream of Alexandrian manuscripts?

ESV:

And there came out from the camp of the Philistines a champion named Goliath of Gath, whose height was six cubits and a span... And David put his hand in his bag and took out a stone and slung it and struck the Philistine on his forehead. The stone sank into his forehead, and he fell on his face to the ground. So David prevailed over the Philistine with a sling and with a stone, and struck the Philistine and killed him. There was no sword in the hand of David. 1 Samuel 17:4, 49-50 ESV

And there was again war with the Philistines at Gob, and Elhanan the son of Jaare-oregim, the Bethlehemite, struck down Goliath the Gittite, the shaft of whose spear was like a weaver’s beam. 2 Samuel 21:19 ESV

The trustworthy KJV, built off of the Antiochian manuscripts, has it right. Goliath dies but one time and only by the stone slung by the little Shepherd boy, David. Elhanan killed Goliath's brother...

KJV:

And there went out a champion out of the camp of the Philistines, named Goliath, of Gath, whose height was six cubits and a span... And David put his hand in his bag, and took thence a stone, and slang it, and smote the Philistine in his forehead, that the stone sunk into his forehead; and he fell upon his face to the earth. So David prevailed over the Philistine with a sling and with a stone, and smote the Philistine, and slew him; but there was no sword in the hand of David. 1 Samuel 17:4, 49-50 KJV

And there was again a battle in Gob with the Philistines, where Elhanan the son of Jaare-oregim, a Beth-lehemite, slew the brother of Goliath the Gittite, the staff of whose spear was like a weaver's beam. 2 Samuel 21:19 KJV

So if you get your answers from the perverted ESV you get half the answer right but since we are dealing with the Words of God and God's Word is truth then you ultimately get it all wrong...

Pick up the KJV and know that you are standing on solid ground!