How do I interpret Matthew 21:1-11?

It speaks of Jesus Christ’s Triumphant entry to Jerusalem. It happened as fulfillment of prophecies spoken by the prophets in the Old Testament:

• Matthew 21:2-5 “If anyone asks what you are doing, just say, ‘The Lord needs them,’ and he will immediately let you take them.” This took place to fulfill the prophecy that said, “Tell the people of Jerusalem, ‘Look, your King is coming to you. He is humble, riding on a donkey—riding on a donkey’s colt.’”

Zechariah 9:-17 (other parts of this prophecy will be fulfilled when Christ returns on Judgment Day)
Zion’s Coming King
“Rejoice, O people of Zion! Shout in triumph, O people of Jerusalem! Look, your king is coming to you. He is righteous and victorious, yet he is humble, riding on a donkey— riding on a donkey’s colt. I will remove the battle chariots from Israel and the warhorses from Jerusalem. I will destroy all the weapons used in battle, and your king will bring peace to the nations. His realm will stretch from sea to sea and from the Euphrates River to the ends of the earth. Because of the covenant I made with you, sealed with blood, I will free your prisoners from death in a waterless dungeon. Come back to the place of safety, all you prisoners who still have hope! I promise this very day that I will repay two blessings for each of your troubles. Judah is my bow, and Israel is my arrow. Jerusalem is my sword, and like a warrior, I will brandish it against the Greeks. The Lord will appear above his people; his arrows will fly like lightning!

• Revelation 14:14–16 “Then I saw a white cloud, and seated on the cloud was someone like the Son of Man. He had a gold crown on his head and a sharp sickle in his hand. Then another angel came from the Temple and shouted to the one sitting on the cloud, “Swing the sickle, for the time of harvest has come; the crop on earth is ripe.” So the one sitting on the cloud swung his sickle over the earth, and the whole earth was harvested.”

The Sovereign Lord will sound the ram’s horn and attack like a whirlwind from the southern desert. The Lord of Heaven’s Armies will protect his people, and they will defeat their enemies by hurling great stones. They will shout in battle as though drunk with wine. They will be filled with blood like a bowl, drenched with blood like the corners of the altar. On that day the Lord their God will rescue his people, just as a shepherd rescues his sheep. They will sparkle in his land like jewels in a crown. How wonderful and beautiful they will be! The young men will thrive on abundant grain, and the young women will flourish on new wine.”

Psalm 118:24–29 “This is the day the Lord has made. We will rejoice and be glad in it. Please, Lord, please save us. Please, Lord, please give us success. BLESS THE ONE WHO COMES IN THE NAME OF THE LORD.

• Matthew 21:9 “Jesus was in the center of the procession, and the people all around him were shouting, “Praise God for the Son of David! Blessings on the one who comes in the name of the Lord! Praise God in highest heaven!”
• John 17:11 (Jesus speaking) “Now I am departing from the world; they are staying in this world, but I am coming to you. Holy Father, YOU HAVE GIVEN ME YOUR NAME; now protect them by the power of your name so that they will be united just as we are.”

We bless you from the house of the Lord. The Lord is God, shining upon us. Take the sacrifice and bind it with cords on the altar. You are my God, and I will praise you! You are my God, and I will exalt you! Give thanks to the Lord, for he is good! His faithful love endures forever.”