He saw the whole of existence within himself, and himself within the whole of existence. Siddharthas search for the Truth had ended. At the age of thirty five he had become Buddha. Siddhartha, the Buddha, continued to sit in meditation. He left the shelter of the bodhi tree to go forth and teach others what he had learned.
Life ends in death.
The cause of sufferings of life is desire and our bad deeds, the Karma. The end of desire leads to the end of suffering. The way to end desire, and hence to end suffering, is to follow the righteous path and discovering the divine Truth that is inherent in us. The five hermits became his first disciples. Buddha then traveled far and wide, teaching the four noble truths as well as the art of meditation to purify body, speech, and mind.