Write this same question in “google”.

It explains itself, really.

Jesus is the image of God and was the firstborn over the world. He is also God, one of the trinity (Father, Son and Holy Spirit) so He created all things. All things were created by Him and for His purposes.

The Christian knows the church is the body of believers and Jesus is the head of that body.

Jesus was the firstborn from among the dead, because He was the first who was raised from the dead.

By the sacrifice of Jesus on the cross, God reconciles all things in the universe through that sacrifice, because nothing else will be able to do so.

He is the image of the invisible God, the firstborn of all creation; 16for in him all things in heaven and on earth were created, things visible and invisible, whether thrones or dominions or rulers or powers—all things have been created through him and for him. 17He himself is before all things, and in him all things hold together. 18He is the head of the body, the church; he is the beginning, the firstborn from the dead, so that he might come to have first place in everything. 19For in him all the fullness of God was pleased to dwell, 20and through him God was pleased to reconcile to himself all things, whether on earth or in heaven, by making peace through the blood of his cross.

In most mainstream interpretations you could summarize this passage as Jesus is king of everything.

An example of one summary is:

A. The Full Glory of Christ, the Son of God (Colossians 1:15-23)

The mention of God’s beloved Son, who is God’s redemption and forgiveness in person (verses 13-14), leads over to a mighty hymn in praise of Christ in His fully glory as Creator and Redeemer. Paul holds before the eyes of the church all that they have in Him whom Epaphras (verse 7) proclaimed to them…

He is God’s image, the perfect manifestation of the invisible God; the first-born of all creation, the Mediator of creation the Lord over all created beings, including all angelic powers (thrones, dominions, principalities, authorities).

As He is Lord of creation, He is also head of the church; as He is the first-born of all creation, He is also the first-born from the dead, the Lord in whom all mankind may find life everlasting.

In Him all the fullness of the God who willed man’s redemption GRACIOUSLY DWELT: IN OBEDIENCE TO THAT WILL He went into the depths of a criminal’s violent death (death of His cross) to restore man and all man’s fallen world to God.

He is in everything…pre-eminent; in His kingdom (verse 13) they are secure–no powers of darkness have power to harm them there.