To find a shorter way to get to India.
He was looking for a route to India and thought if he went west he would find it. He didn't count on the actually size of the world.
He tried to find a western passage to south east Asia.
he wanted to find new land
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To look for a new trade route to India
he want to prove that the world was round and not flat
there was lots of reason, why there was a fight in Europe but the main reason was Germany and France wore fighting for strongest navy.
He was searching for a shorter, faster trade route to India.
Columbus went to the Americas in search of a direct sea route to Asia for trading goods like spices and other valuable resources. He believed he could find a quicker route by sailing west from Europe instead of going east, around Africa.
Africa would be the main answer, but there are parts of Europe where you could sail south and reach Asia, like sailing across the Black Sea to Turkey.
We have n record that they did.