Cambridge Dictionary gave the following rules that will help us learn how to use “beside” or “besides”
A. Beside is a preposition. It means ‘at the side of’ or ‘next to’. It is rather formal:
Example: He would like to take a photograph of us. Would you come and sit beside me?
B. Besides is a preposition or a linking adverb. It means ‘in addition to’ or ‘also’:
Example: What other types of music do you like besides classical?
As a linking adverb, we usually put a comma before and after besides in writing:
Example: I don’t think going for a walk is a good idea. It’s quite cold, and, besides, it’s getting late and we don’t want to be out in the dark.
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