Essentially “spreading the gospel” is the sharing of the good news of Jesus Christ. It's a venture of expressing the love, salvation, and promises of God to others. The gospel at its core is the narrative of Jesus' life, death, and resurrection, offering hope and redemption to mankind.
Jesus said, "Go therefore and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, teaching them to observe all that I have commanded you. And behold, I am with you always, to the end of the age." Matthew 28:19-20