Since the wind moves horizontally, why are there different wind directions?

Who said that if the wind moves horizontally,

it won’t have different directions?

Your argument is simply untenable.

The horizontal direction has different

directions in all directions. How can it be just one direction!

And the wind is not necessarily in the horizontal direction, it is possible to be diagonally upward

and diagonally downward. Often the temperature in a certain place is high, and the hot air rises, causing a void below.

The air pressure is low, so the temperature in the distance is low, and

the air pressure is high. The air in the local area will be pressed over

This will form wind, which is not necessarily horizontal