What does Acts 2 teach about salvation?

In Acts 2, Peter's sermon emphasizes the necessity of Jesus's death and resurrection for salvation. He challenges the crowd, stating that the same Jesus they had crucified is now exalted and offers salvation. Peter directly applies Old Testament prophecy to affirm that Christ's resurrection was part of God's sovereign plan for redemption. Ultimately, he declares that 'whosoever shall call on the name of the Lord shall be saved,' establishing Jesus as the sole source of salvation and underscoring the Reformed understanding of grace and faith.