v15
No one can see God through their eyes, but Jesus is exactly like God, is ranks higher than anything ever made. So through Jesus, we see what God is actually like! But he's not "exactly the same" he IS the same! Jesus was made in God's image, and in man's image, so Jesus is the firstborn over creation, he's kinda like our older brother. Like in the olden times everything used to go the first born, Jesus gets all the Father's inheritance. But through being saved, we get a share in the inheritance - woooo!
v16-17
All things were made for CHRIST and his sake. He was there before anything was made, and he's the reason why thigns are still there. Kinda weird, I always think that Jesus was "there" when he was a baby, but he wasn't he was there before. Weird thoughts huh! He rules over the thrones, powers, rulers, and authorities in the entireeeee universe. He has ultimate supremacy :)
v18
Christ is head of the church (not the queen) but also the head of the body. Think of a body with no head, pretty useless. Same is without Jesus. Christ also CREATED the church!! And through him, many are turned to God and christianity. People can also (hopefully) see Christ through us, even if they can't see him. This has gotta be our aim in life, to show Jesus through us
v19-20
God has given all of his power to Christ, and given to Christ in his fullness. and through the holy spirit, we can have this too! Go's purpose was through Jesus to reconcile himself. The sacrifice of JC, transferred all the punishments. We can't be held guilty anymore!! We are reconciled to God, we no longer have separation* but peace. We're not just forgiven, we're reconciled. ALL things will be placed under God, even satan.
Application
Basics yeah, Jesus is number one. Jesus is the only way to God, and he's the only one who can reconcile. YEEEEEEEAH, good stuff :)