Acts 2.36 reveals God has made this Jesus both Lord and Christ.
Jesus is Lord of all that is and was and is to come and is alone the means for humanity to be reconciled to God. As Christ, Jesus is the Savior of the world.
This means it is only by Him and through Him that humanity can be reconciled to God.
Jesus is Savior because God requires a sacrifice for all the evil all humanity has done and is doing. Jesus was that perfect sacrifice because He alone lived a perfect life, never disobeying God but always thinking, speaking and doing as God the Father commands all humanity.
While He alone earned His eternal reward He instead offered His life in exchange for all humanity who has always failed to always do what pleases God. The father was pleased to accept this exchange, punishing Jesus on the cross for all the evil things people have done throughout all the ages.
Those who accept this exchange, those who receive Jesus’ work for them, those who humble themselves before God admitting they need a Savior are pardoned and must begin to follow Jesus Who is now their Lord.
Jesus as Lord means He rules not only all things but over individual lives as well. Jesus as Lord is to be obeyed as our Master and we are His slaves.
Jesus is humble and gentle and His way is neither harsh nor burdensome for He is good and He is kind and He is loving.
Yet as Lord, Jesus commands that we obey Him, loving Him with all of our heart, soul, mind and strength and loving our neighbor as we love ourselves.