Other than Jesus, what is the main message of Christianity?S28e170Lk24:45

When Jesus shows Himself to the disciples after the resurrection, He tells them what their message should be:

First of course, is Jesus Himself. His life, suffering, death and resurrection.

Second, is repentance for the forgiveness of sin. Other than Jesus, this is the main message of Christianity.

https://youtu.be/rFswFpQmAZc