How do we know Christ is central to the Old Testament?

Throughout the Old Testament, it is clear that the scriptures testify of Christ and His redemptive work. Christ Himself stated that 'the whole Old Testament speaks of Him,' meaning every book has its relevance pointing to His coming, the fulfillment of the covenant, and actions of salvation. For instance, the visions and messages given to prophets like Zechariah provide striking imagery of Christ's crucifixion and His role as savior. Understanding the Old Testament in light of Christ not only affirms its relevance but also enriches our faith as we see God's unfolding plan throughout history.