How to say "firstly, first of all" in Russian?

Во-первых

"firstly, first of all" is Во-первых in Russian.

Во-первых means "firstly, first of all" in English.

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Word #1287 of 4,000 by frequency in Russian — level B1.

Example

Во-первых, я хочу поблагодарить всех за помощь.

Firstly, I want to thank everyone for their help.