Santiago having his repetitive dream, where a boy is playing with his sheep and the boy shows Santiago where his treasure is, but never what it is, under the sycamore tree
This is where he first learns about some treasure that's waiting for him at the pyramids
Santiago and the king, Melchizedek meet
Santiago learns from Melchizedek about following his personal legend, Along with many other wise words from him. He also gives Santiago Urim and Thummim.
The crystal merchant and Santiago meet
Santiago learns how to work in a crystal shop, and arabic, but most importantly he learns from the merchant that some people rather think about their PL rather than doing it. So this taught him to not have regrets and to follow his PL, while he has the chance.
Santiago meets the love of his life, Fatima.
Fatima teaches Santiago to not let love can get in the way of things and that true love/if they were meant to be together they would meet again
Santiago finds his treasure, which was a chest of gold, at the church where he first had his dream. But he learns that the real treasure was the journey.