What are 3 mistakes that Santiago makes in Paulo Coelho's The Alchemist?

Within the
context of the novel, Santiago's mistakes aren't mistakes as such, but lessons that he needs to
learn to achieve his Personal Legend.

Arguably, the only true mistake he
makes is at the very beginning of his travels when he entrusts his money to the Arab man in the
bar on the flimsy basis that the man speaks Spanish and dresses in Western-type
clothes.

The new arrival was a young man in Western dress,
but the colour of his skin suggested he was from this city. He was about the same age and height
as the boy.

His distrust of the other people in the bar,
who act and talk more like locals, is highlighted when he comments on their smoking
habits,

"A practice of infidels," he said to
himself. . . . The boy felt ill and terribly alone. The infidels had an evil look about
them.

The loss of his money, however, liberates him. Now
he has to trust the so-called infidels in order to survive. This quickly leads to him getting a
job at the crystal shop.

After this, his only other mistakes,
if...