Once again, we strongly recommend reading the four Gospels (Matthew, Mark, Luke and John) yourself to see for yourself what he taught, but this is a quick snapshot (in no particular order of importance):
Out of all the teachings of the Old Testament, Jesus was once asked which was the most important commandment. This is what he said:
37 And he said to him, “You shall love the Lord your God with all your heart and with all your soul and with all your mind. 38 This is the great and first commandment. 39 And a second is like it: You shall love your neighbor as yourself. 40 On these two commandments depend all the Law and the Prophets.” (Matt. 22:37-40 – see also: Mark 12:30-21)
He taught us to love one another (John 13:34) and to love our enemies (Matt. 5:44). We are to abide in His love (John 15:9) and that we demonstrate love towards Jesus by keeping his commandments (John 14:21).
Jesus taught that we should not grow tired of forgiving others (Matt. 18:21-22), and that when we do forgive people who sin against us, our heavenly Father will also forgive us (Matt. 6:14-15 ;Luke 6:37). He taught us that we should not approach worship without reconciling with our brothers and sisters in Christ (Matt. 5:23-24). If someone knows they have done wrong and turned from their sin (the Bible calls this ‘repentance’), we are to forgive them also (Luke 17:3-4).
Jesus taught that although he was God, he did not come to be served but to serve (Matt. 20:28; Mark 10:45). He demonstrated incredible humility in serving others above himself and taught that we were to do the same (John 13:12-14; Matt. 10:44-45). Jesus also taught that we are not to seek earthly renown but heavenly glory; something that is to be found by putting others before ourselves (Matt. 23:11; Matt. 25:35-40; Luke 22:25-27).
That Jesus Himself was the Messiah
In John 4:25-26, Jesus says that he is the Messiah, the promised and long-expected deliverer of the people of God. He acknowledges being the Christ after Peter’s confession in Matthew 16:15-17 and also during his trial (Matt. 27:11; Mark 15:2; John 18:36-37).
That He was the Saviour of the World
Jesus taught that there was no other way to the Father except through Jesus (John 14:6). He taught that he was the gate to heaven (John 10:10) and the good shepherd who leads his sheep (John 10:11). He is the light of the world (John 8:12) and the bread of life; whoever comes to him will never be (spiritually) hungry again (John 6:35).