The key takeaway here is that the Bible is a unified whole. The entire OT points to Christ and His kingdom.
The Bible is a hard book. It was written thousands of years ago in other languages and in different cultures. Christians therefore need resources to help them study the Bible.
God is always the hero in the story of the Bible. He created man from the dust to bring Him glory, yet man has continually rebelled against Him. But God in His grace and goodness has been redeeming man ever since, restoring man in his relationship with Him and promising to fully redeem His people at the final resurrection.