What is the gospel?

What is the Christian Gospel? An examination of what the Bible says.

See also these excellent videos on the same topic:
https://www.youtube.com/watch?v=KsMs9HoocpY (David Wood)
https://www.youtube.com/watch?v=t1BWSOVNm4A (Paul Washer)
https://www.youtube.com/watch?v=xrzq_X1NNaA (Bible Project)
https://www.youtube.com/watch?v=hHx5Bctu9X0 (John MacArthur)

My series on the Messiah in Isaiah:
https://www.youtube.com/watch?v=EVmqWnwBWpI&list=PLsstdlF0MZTYRRPv5sr9FSTkvE1-MbxJO&index=7

My series on the reliability of the Bible:
https://www.youtube.com/watch?v=yre9LESs06I&list=PLsstdlF0MZTbhTI3rRcdAscLjN1PVQMgV

My series on Science and the Bible:
https://www.youtube.com/watch?v=LIPapQjShbg&list=PLsstdlF0MZTbOetY-wowDlIPmjhVHhb2W