1 Corinthians 15:1-4  (NASB)
15:1 - Now I make known to you, brethren, the gospel which I preached to you, which also you received, in which also you stand, 2 by which also you are saved, if you hold fast the word which I preached to you, unless you believed in vain. 3 For I delivered to you as of first importance what I also received,  that Christ died for our sins according to the Scriptures, 4 and that He was buried, and that He was raised on the third day according to the Scriptures,...

The Gospel or "Good News," is the most important message one could ever hear. Good news for those who do not believe and are looking for answers and continuous encouragement for those who by God's grace have already believed.

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Another presentation of the gospel

If you believe the gospel, it will change you. 

Read the Bible with wisdom. A good place to start is the Gospel of John.