Grammatical Difference between "First" and "Firstly"

"First" is an adjective or adverb that indicates the initial occurrence or position in a sequence.

For example:

"He is the first person to arrive."

"Firstly" is an adverbial form of "first" used to indicate the initial point in a sequence of items or events.

For example:

"Firstly, we'll discuss the agenda for the meeting."

In summary, "first" is an adjective and adverb,

while "firstly" is an adverb that indicates the first point in a sequence of items or events.

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Best Regards,

William Black