In British English you say I love autumn or I love the autumn ('the' is optional). In American English you say I love the fall or fall ('the' is also optional). 'Fall' obviously refers to the falling/fallen leaves: La caída de las hojas.
Season are written in small letters, autumn not Autumn except at the beginning of a sentence. Of course!!!
The preposition is 'in'. Halloween is in autumn / fall.
Pay attention to the pronunciation!
See you next FALL !!!
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