Macbook Firewall Settings Question

Hello,
Under my settings for security on My Macbook Pro, it says that the firewall is turned off. What are the advantages of turning it on and do you suggest doing so? Thanks in advance for any help or suggestions.

If you are behind a secure network,  your own router then you do not need to turn it on.
If you are out in the wild and not on a secure network then yes, turn it on.

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