First we need a strategic grasp of the Bible because God's Word is TRUTH.
Secondly, we need to understand why God gave us these 66 inspired books. To understand why, turn to Luke 24.25-27. Here Jesus gives a seven-mile Bible study to those on the road to Emmaus. Note what He said THEY (the entire Old Testament) SPEAK (every book, every chapter, even every detail) OF ME (the Bible is Christ centered)!
Then He said to them, 'O foolish ones, and slow of heart to believe in all that the prophets have spoken! 26 Ought not the Christ to have suffered these things and to enter into His glory?” 27 And beginning at Moses and all the Prophets, He expounded to them in all the Scriptures the things concerning Himself.
In the thirty-nine Old Testament books, Christ is in the shadows, seen in analogies and in pictures. He is in types and rituals. He is prophesied and anticipated. The twenty-seven New Testament books complete the Old, revealing Christ in person, in truth and reality, in the present and acknowledged.