Answer to #1:   Jesus personally wrote none of them, but He authored ALL of them, because the Bible was written by the inspiration of God.  Jesus is the Word of God, and so all the Word of God is authored by Jesus. 
Answer to #2:  Jesus is the WORD of GOD and the whole Bible is authored by HIM.  Jesus never taught anything while on earth that contradicts the Scriptures He authored before He was incarnate. 
If you can understand this, then you can understand why much doctrine today is heresy, and you can see the need for the books:  Did Jesus Correct Moses and The Alien Exposed 
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