Many understand the gospel only as about what Jesus did, and perhaps what he will do in the future,. But the whole gospel includes what Jesus is doing right now.
Whether we encounter the gospel of Jesus as children in church or in a presentation from an enthusiastic Christian, we may only absorb a few pieces of the whole thing.
The Apostles' Creed lays out all the basics in a short outline, and is affirmed by almost every Christian church in history.