Difference between "Firstly" and "At first"

####Firstly (पहली बात यह कि..)

when talking about a list or enumeration.

e.g. Firstly, I would like to say that elephants are huge animals. Secondly, they don't eat humans. Thirdly, et cetera.

####At first (शुरू- शुरू में)

when talking about the beginning of something.

e.g. At first, Mohan seemed pretty nice. But after a couple of months he revealed his true character.

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