When you die, you are going to stand before God and give an account for your life. Because God is good, He is going to judge you according to the perfect, moral standard of His Law. If you’ve ever lied, stolen, or taken His name in vain; He will find you guilty of breaking His Law. Because God is good, He must punish your sin; and the punishment for all sin against God is eternity in Hell. But God is also merciful, loving, and kind in that He provided one way to escape that punishment; and that was through the gift of His Son Jesus Christ. Jesus Christ: fully-God and fully-Man, without sin. He died on the cross a death He did not deserve, in order to take upon Himself the punishment you rightly deserve, for your sins against God. And then three days later He forever defeated sin and death when He rose from the grave. What God requires of you is that you repent (turn from your sin and turn toward God) and by faith alone, receive Jesus Christ as your Lord and Savior.
Please watch the video below for a much more in-depth explanation of the Gospel: