Question

what are the four sights which changed the life of Siddhartha

Answer 1

After this incident and realizing the true nature of life after observing the four sights, Siddhārtha left the palace on his horse Kanthaka, accompanied only by Channa. He sent Channa back with his possessions and began an ascetic life, at the end of which he attained enlightenment as Gautama Buddha.

Answer 2

when he saw funeral procession,a sick man,an old man,and finally a man begging for alms.
Hope it helps u